港口与航道工程安全生产要求中,现场施工用电必须实行(),所有电器设备必须做到“一机、一闸、一漏电”。
A.两相三线制
B.两相四线制
C.三相五线制
D.三相四线制
参考答案:C
-What!Ten minutes ago you told me there were no rooms. You just gave one to that man!
-You ________ to understand, sir. That man has a reservation.[ ]
A.didn't seem
B.don't seem
C.haven't seemed
D.hadn't seemed
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