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【单选题】
遇上麻烦时,通常 向 老师 寻求帮助。( turn to )A.
That child usually turns to his teacher for help when he meet troubles.
B.
That children usually turns to his teacher for help when he meets troubles.
C.
That child usually turns to his teacher for help when he meets troubles.
D.
That child usually turn to his teacher for help when he meet troubles.
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【单选题】互感器检定中使用的电源及调节设备，应保证具有足够的容量及调节细度，并应保证电源的频率为（），波形畸变系数不得超过5%。
A.
50Hz
B.
51±0.2Hz
C.
51±0.5Hz
D.
51±0.1Hz
【单选题】互感器检定中使用的电源及调节设备,应保证具有足够的容量及调节细度,并应保证电源的频率为_,波形畸变系数不得超过5%。
A.
50Hz
B.
50士0.2Hz
C.
50士0.5Hz
D.
50士0.1Hz
【单选题】—I saw you come to school by bus this morning. —Oh, I _______ come to school by bus, but it is raining today.
A.
sometimes
B.
always
C.
hardly
D.
usually
【单选题】互感器检定中使用的电源及调节设备,应保证具有足够的容量及调节细度,并应保证电源的频率为( )波形畸变系数不得超过5%。
A.
50Hz
B.
50±0.2Hz
C.
50±0.5Hz
D.
50±0.1Hz
【单选题】— I saw you come to school by bus this morning. — Oh, I come to school by bus, but it is raining today. [ ]
A.
hardly
B.
always
C.
sometimes
D.
usually
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