题目内容
（请给出正确答案）
21 The low-income children are very grateful to the dentists.
A Right B Wrong C Not mentioned
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更多“21 The low-income children are…”相关的问题
有以下程序： main { union { char ch[2]； int d； }s； d=0x4321； printf("％x，％x＼n"，S．ch[0]，S．ch[l])； } 在16位编译系统上，程序执行后的输出结果是()
A.21，43
B.43，21
C.43，00
D.21，00
γ-羧基丁酸转化为γγ丁内酯的反应如下：
HOCHCHCHCOOH 该反应在25℃于0.2mol/L的盐酸中进行。已知羟基丁酸的初始浓度为18.23mol/dm，在不同时刻测得丁内酯的浓度如下：
t(min) | 0 | 21 | 36 | 50 | 65 | 80 | 100 | ∞ |
丁内酯浓度(mol/dm3) | 0 | 2.41 | 3.76 | 4.96 | 6.10 | 7.08 | 8.11 | 13.28 |
若正逆反应均为一级，试计算反应速度常数k1和k-1以及平衡常数K。
Promotions are usually used to attract low-income shoppers.
A．Y
B．N
C．NG
The tuition fees are______ to students coming from low-income families.
A．approachable
B．payable
C．reachable
D．affordable
The low-income children are very grateful to the dentists.
A．Right
B．Wrong
C．Not mentioned
A．Y
B．N
C．NG
The tutition fees are ______to students coming from low-income families.
A.approachable B.payable C.reachable D.affordable
Compared with the 1970 unmarried low-income men, their 2007 counterparts______.
A．had even less education
B．had lower marriage rates
C．had slower growth in household income
D．had more trouble adjusting for inflation
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