题目内容

Don't forget to wash your hands ________you have meals.

A. before
B. until
C. though
D. unless

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Come on,________you'll be late.

A. and
B. but
C. or
D. so

Good to see you again. It's almost three years ________we met last time.

A. until
B. before
C. while
D. since

-Do you like sports?-Yes,I do some running in the park every day ________the weather is terrible.

A. if
B. after
C. unless
D. while

正弦交流电路某支路阻抗Z=3-j4Ω，则下列说法错误的是（）

A. 该支路呈感性。
B. 该支路阻抗模等于5Ω。
C. 该支路电压相位滞后该支路电流相位。
D. 该支路呈容性。