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【单选题】
风机安装完毕后需进行试运转，风机试运转时应符合的要求为（）。A.
以电动机带动的风机启动后即可直接进入
B.
风机运转达到额定转速后，风机调理到设计负荷
C.
风机启动后，不得在临界转速附近停留
D.
风机的润滑油冷却系统中的冷却水压力应高于油压
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举一反三
【单选题】Look out! Don’t get close to the house, ______ the roof is under repair．
A.
whose
B.
which
C.
of which
D.
that
【单选题】.Look out! Don’t get too close to the house ______ the roof is under repair.
A.
whose
B.
which
C.
of which
D.
what
【单选题】—Why do you look so tired? —I ________ a day off since last month. [ ]
A.
didn't put
B.
didn't get
C.
haven't had
D.
hadn't taken
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