一般情况下，安全搭载量有（）mm即可。
A.10
B.5
C.3
参考答案：B
方程x2+y2+ax+2ay+2a2+a-1=0表示圆，则a的取值范围是______．
In his speech, he said that it was his primary school teachers that he was fond of ________influenced his whole life.
A．what
B．which
C．as
D．who
