A:intended to
B:had intended to
C:was intended to have
D:had intended to have
维生素、无机盐在人体内含量都不多,但作用都很大.(判断对错)
已知y=fx是可导函数,“f'x0=0”是“x0为函数fx极值点”的( )
— Mr.Song Zhongji visit Suzhou last week?
—No,but he Suzhou with his friends next year.
某实验小组利用如图1所示电路测定一节电池的电动势和内电阻,备有下列器材:
①待测电池,电动势约为1.5V(小于1.5V)
②电流表,量程3mA
③电流表,量程0.6A
④电压表,量程1.5V
⑤电压表,量程3V
⑥滑动变阻器,0~20Ω
⑦开关一个,导线若干