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【单选题】
两个共点力,大小都是 50 N ,如果要使这两个力的合力也是 50 N ,这两个力之间的夹角应为( )A.
30 0
B.
60 0
C.
120 0
D.
150 0
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【简答题】两级放大电路，已知第一级AV1=－100,第二级AV2=－50,则总电压放大倍数Av= [填空(1)] 。A. AV=5000
【简答题】By the time he arrives in Beijing, we ______ here for two days. A) will have stayed B) shall stay C) have been staying D) have stayed
【单选题】By the time he arrived in Beijing, we _____ there for two days. [ ]
A.
will have stayed
B.
stay
C.
have been staying
D.
had stayed
【多选题】以下说法错误的是（）
A.
用户现有手机、号码和SIM卡可直接接入TD-LTE网络。
B.
使用TD-LTE的终端可以支持国际漫游。
C.
LTE终端插入SIM卡或USIM卡都可以接入LTE网络。
D.
TD-LTE与LTE FDD双模终端具备接入我公司LTE网络的能力。
【单选题】It _____ we have stayed together for a couple of weeks _____ I found we had a lot in common. [ ]
A.
was until; when
B.
was until; that
C.
wasn't until; when
D.
wasn't until; that
【简答题】酸价(acid value，AV)
【单选题】The hotel _____ during our holidays stands by the seaside.
A.
we stayed at
B.
where we stayed at
C.
we stayed
D.
in that we stayed
【单选题】By the time he arrives in Beijing, we_______________here for two days. [ ]
A.
will have stayed
B.
have been staying
C.
shall stay
D.
have stayed
【简答题】三级放大电路中AV1=AV2=AV2=20 dB，则总的电压增益为_________dB；电路将输入信号放大了_________倍。 a．60 dB b．50 dB c．106 d．3
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