钨靶X线机，产生特征X线的最低管电压是A．35kV B．50kVp C．70kVp

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问题单项选择题

钨靶X线机，产生特征X线的最低管电压是

A．35kV

B．50kVp

C．70kVp

D．85kVp

E．90kV

答案

参考答案：C

解析：钨靶X线机，管电压在70kVp以下，不产生特征X线。

选择题

--- Do you think that the 11th Chinese National Games were a success ?

--- Yes, ___! It couldn’t be ____ .

A．relatively ; better

B．approximately ; worse

C．absolutely ; better

D．fortunately ; worse

单项选择题

已知如下代码: boolean m=true; if(m==false) System.out.prinfln("False"); else System.out.println("True");

A．False

B．True

C．None

D．An error will occur when running