不同的电压等级电网中性点接地方式的（），应结合具体条件，综合考虑各个方面的要求。
参考答案：选择
某种生物孢子的直径为0.00063m，用科学记数法表示为[ ]
A．0.63×10﹣3m
B．6.3×10﹣4m
C．6.3×10﹣3m
D．63×10﹣5m
Sometimes the police are not absolutely sure that someone has committed a crime, but ________ him of having done it.
A．charge
B．suspect
C．inspect
D．doubt
