I have to study for my English test _____ Friday.[ ]
A. with
B. from
C. as
D. on
答案:D
如图所示电路,电流表示数I,电压表示数为U,则( )
A.U=0时,R=0
B.U变大时,UI变大
C.U变大时,UI变小
D.U变大时,UI不变
下列哪项不是乌贼骨的功能
A.收敛止血
B.固精止带
C.制酸止痛
D.补肾壮阳
E.收湿敛疮