题目内容（请给出正确答案）

[主观题]

The oil in a cargo winch gear box should be sampled periodically to _____.A.prevent the ge

The oil in a cargo winch gear box should be sampled periodically to _____.

A.prevent the gear box from leaking

B.prevent the oil from becoming inflammable

C.make sure it has not become contaminated

D.make sure the motor bearings are lubricated

提问人：网友apple_cug 发布时间：2022-01-07

参考答案

查看官方参考答案

如搜索结果不匹配，请联系老师获取答案

您可能会需要：

重置密码查看订单联系客服

安装简答题APP，拍照搜题省时又省心！

更多“The oil in a cargo winch gear …”相关的问题

第1题

At this stage, the ______ of ideas are more important than getting grammatical structures, punctuation or spelling correct.

A、developed

B、developmental

C、development

D、developing

点击查看答案

第2题

Suppose a population consisted of 20 items. How many different samples of n = 3 are possible?

A、6840

B、1140

C、20

D、120

点击查看答案

第3题

When comparing the variances of a population distribution and a sampling distribution of means from the population the:

A、variances are equal.

B、population variance is smaller than the sampling distribution variance.

C、population variance is larger than the sampling distribution variance.

D、variances have the same degrees of freedom.

点击查看答案

第4题

The standard error of the mean is:

A、the standard deviation of the sampling distribution of sample means.

B、always normally distributed.

C、sometimes less than 0.

D、the variance squared.

点击查看答案

第5题

The difference between the sample mean and the population mean is called the:

A、population deviation.

B、population standard deviation.

C、standard error of the mean.

D、sampling error.

点击查看答案

第6题

For the sampling distribution of sample means, what is the relationship between the population mean and the mean of all possible sample means of size 25?

A、They are equal.

B、They are not equal.

C、They are different by one standard error of the mean.

D、They are both normally distributed.

点击查看答案

第7题

When estimating population parameters, a point estimate is:

A、a range of possible values for a population parameter.

B、always equal to a population value.

C、a statistic that estimates a population parameter.

D、the population mean.

点击查看答案

第8题

A population distribution is normal with a mean of 18 and standard deviation of 4. A sample of 16 observations is selected and a sample mean computed. What is the probability that the sample mean is more than 18?

A、0.5

B、1.0

C、0.0

D、18

点击查看答案

第9题

If we wish to decrease the width (increase the precision) of a confidence interval, we would:

A、increase the size of the sample.

B、reduce the size of the population.

C、raise the level of confidence.

D、compute the mean.

点击查看答案