分配阀中，阀孔与阀杆配合的标准间隙为（）
A、0.015~0.025
B、0.025~0.030
C、0.030~0.040
参考答案：A
( )大二芯插头的顶端总是与信号冷端相连接的。
It's important for us to ______ a word or a phrase according to the situation in language studies. [ ]
A. employ
B. refer
C. make
D. work
