压入法固定型芯时，型芯与固定板的配合采用（）。
A、H9/f9
B、H7/f7
C、H7/m6
D、H7/s6
参考答案：C
It's freezing outside. You _______ put on your overcoat. [ ]
A. had better to
B. had better
C. would better
D. would better to
快速式电水加热器适于______单体热水器使用。
A．家庭
B．工业
C．公共浴室
D．公共建筑
eezing outside. You _______ put on your overcoat. [ ]