题目内容

If Harry did not attend the conference last night, he _____ too much work to do.

A. had had
B. must have
C. had to have had
D. must have had

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在海上，仅看到来船的一盏红灯，则来船为＿＿＿＿。

A. 在航帆船
B. 在舤中的机帆并用船
C. 搁浅船
D. L＞7米的机动船

为了确保输气管道安全可靠的运行，必须从设计、施工、()、日常运行管理、维修等各个环节切实抓好安全工作。

A. 选择管材
B. 管线焊接
C. 投产试运
D. 输送能力

Although I do not share his religious_______ , I respect him.

A. believe
B. believing
C. belief
D. trust

12米≤L＜20m船舶的桅灯最小能见距离为＿＿＿＿。

A. 5海里
B. 3海里
C. 2海里
D. 1海里