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【单选题】
保留灌肠后药液应( )后排便A.
保留5～10分钟
B.
保留10～20分钟
C.
保留20分钟以上
D.
保留30分钟
E.
保留1小时以上
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举一反三
【单选题】You'd better not ask such questions again, ______?
A.
hadn't you
B.
had you
C.
would you
D.
wouldn't you
【单选题】智能火灾报警系统中报警设备分为自动感应报警设备和手动确认报警设备两种，下列属于自动感应报警设备的是______。
A.
点型光电感烟探测器
B.
手动火灾报警按钮
C.
消火栓按钮
D.
防爆手动火灾报警按钮
【单选题】—Do you think John will help me move the piano? —You'd better not ask him. He _______ a composition. [ ]
A.
write
B.
writes
C.
is writing
D.
wrote
【单选题】You'd better not ask him for help. He will not try his best ___ he agrees to help you.
A.
although
B.
even if
C.
because
D.
even though
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