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问题 单项选择题

一台六缸柴油机的活塞行程为145MM，缸径为120MM，该机的气缸工作容积为（）

A.1.639L

B.1.312L

C.9.83L

D.10.62L

答案

参考答案：A

选择题

From what he has said, let's make a ________ guess about how the accident happened.[ ]

A. clear  

B. sure

C. certain  

D. tentative
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单项选择题

The nurse is teaching the mother of a neonate. The nurse should instruct the mother to introduce her infant to solid foods at what age

A．2 months.

B．4 months.

C．6 months.

D．8 months.
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