HF-7型方向盒最大可容纳六路端子的数量为()。
A.7个
B.9个
C.10个
D.11个
参考答案:D
I feel it hard to keep up with my classmates in study and sometimes I lose heart. But whenever I want to ,
my teacher always encourages me to work harder. [ ]
A. go on
B. run away
C. give up
D. look out
二级中误差公式为()。
A.0.02+0.0006S
B.0.01+0.0003S
C.0.02+0.001S
D.0.04+0.003S