单项选择题

对危险废弃物进行填埋时必须先进行固化处理（）

A．对
B．错

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单项选择题

The following are descriptions of the excitatory conduction characteristics of nerve fibers. Which one is correct?
A、One-way conduction can only be conducted from the cell body to the periphery.
B、The fibers in the nerve trunk do not interfere with each other.
C、As long as the structure is complete, it can conduct excitation normally.
D、It is not affected by the change of internal environmental factors.

单项选择题

单位样值函数δ(n)在n=0处的幅度为
A、A、1
B、B、0
C、C、∞
D、D、都不是