远距T射线放射治疗设备照射室面积一般不应小于多少平方米（）。
A.50
B.40
C.30
D.20
E.10
参考答案：C
____, a form must be filled in.
A．To ask for his job
B．In order to get his job
C．Making request for his job
D．If you want to get this job
既能活血调经，又能凉血安神的药物是（）。
A.川芎
B.桃仁
C.丹参
D.赤芍
E.红花
