肉的质量检验一般是以 、 、 等三方面进行鉴定的

A、感官检验

B、理化检验

C、微生物检验

D、以上都包括

A、12345

B、13245

C、12435

D、14235

For the circuit shown, the current that passes through the 6Ω resistor is 4A . The current that passes through the branch with two 3Ω resistors is also 4A . What is the current that passes through resistor R 1 ?

A．2A

B．4A

C．8A

D．16A

Then one found it difficult to believe that one would fall all the way down to the center ofthe eartThen one found it difficult to believe that one would fall all the way down to the center ofthe earth without gravity.

A．≥800%

B．≥600%

C．≥450%

D．≥300%