单项选择题

构架花束的项目创新不足，不可以做重要比赛的项目。
A. 对 B. 错

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多项选择题

Which of the following analysis about well nodal system without a choke is correct:

A． A solution to solve multi-system compatibility.
B． Solution node may be at any point of any part of the flow system.
C． There’s interaction between the inflow and outflow curves.
D． There must be an intersection of the inflow and outflow curves.

单项选择题

粉尘分散度越大，则对人体所能引发的危害越大。
A、正确
B、错误