利用直流小功率信号来控制较大的交流功率的一种电器,称()。
参考答案:磁放大器
女性生殖系统结核好发于()
A.卵巢
B.宫体
C.宫颈
D.输卵管
E.盆腔
—I didn’t see her yesterday,I looked for her everywhere,but couldn’t find her.
—Oh,but you .She was working in the office.
A.must have
B.ought to
C.ought to have
D.can’t have