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【简答题】
皮肤被强酸灼伤时应（ ） A. A．用稀氢氧化钠溶液冲洗 B．用2%醋酸溶液冲洗 C．用浓氨水和生理盐水交替冲洗 D．用石灰水和1%氨水交替冲洗
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【单选题】I have waited for her since _____.
A.
two hours ago
B.
two hours before
C.
two hours’ time
D.
two hours
【单选题】Miss Gao has taught us English two years. I have been here two years ago. [ ]
A.
since; for
B.
since; since
C.
for; since
D.
for; for
【单选题】分析阻容耦合低频小信号放大电路时,通常采用交流量和直流量分开的方法,这是由于( )
A.
BJT或FET是非线性元件
B.
电路中存在着阻容元件
C.
BJT 或 FET 是受控元件
D.
电路中既有直流量又有交流量
【单选题】The twins has studied in this school .
A.
two years ago
B.
since two years ago
C.
for two years ago
D.
since two years
【单选题】He has been running______.
A.
since two hours
B.
for two o’clock
C.
two hours ago
D.
for two hours
【单选题】I haven’t seen you ____________.
A.
for two months
B.
since three weeks
C.
since last Monday ago
D.
two days ago
【简答题】在低频小信号放大电路的分析中,直流通路中电容视为(),交流通路中大电容可视为(),已知负载开路时输出电压为2V,接入2千欧负载电阻后输出电压变为1V,则放大器的输出电阻约为()
【单选题】The twins has studied in this school ________ .
A.
two years ago
B.
since two years ago
C.
for two yeas ago
D.
since two years
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