题目内容

Pneumonia is a common illnessoccurs in all age groups.

A. where
B. what
C. that
D. whether

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Appendicitis is a condition characterized by inflammation of the appendix,has been recognized as one of the most common causes of severe acute abdominal pain.

A. it
B. what
C. that
D. which

减速防护地段终端信号牌表示限速区段到此为止。

A. 对
B. 错

凡线间距离不足规定时，则应设置矮型的移动减速信号牌。

A. 对
B. 错

站内线路上施工时，将施工线路两端道岔扳向不能通往施工地点的位置，并加锁或钉固，可不设移动停车信号牌。

A. 对
B. 错