多项选择题

测试后方阻偏大，原因可能有：

A.小N2流量偏大
B.小N2流量偏小
C.扩散温度偏大
D.扩散温度偏低
E.源温偏高
F.石英管刚洗没有做TCA饱和

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单项选择题

_____ is inconceivable that the boy might have stolen the money and fled. A.
He B.
This C.
There D.
It

不定项选择

Services provided by hospitals in the UK can be directly accessed by walk-in patients.

A．错误
B．正确