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问题 单项选择题

所有煤水（介）料桶上方必须设置篦子，篦子的孔径不得大于（），在生产过程中，篦子检查口必须密闭盖好。

A.20mm

B.15mm

C.10mm

D.5mm

答案

参考答案：C

选择题

---- Have you ________ Tim to go with us'?

---- No. He wants to but he ________ care for his sister because his parents are busy.

A．regretted; should

B．persuaded; has to

C．contacted, likes to

D．introduced; needs to
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单项选择题 A1/A2型题

胃癌的血行播散最常转移到（）

A.骨髓

B.肺

C.肾上腺

D.腹膜

E.肝脏
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