儿科第一部关于痘疹的专著是：（）
A.《小儿痘疹方论》
B.《小儿斑疹备急方论》
C.《小儿病原方论》
D.《幼幼新书》
E.《活幼心书》
参考答案：B
—He has _______his dictionary. Have you seen it?
—Yes, of course. I _______ it on your desk just now. [ ]
A. lose; saw
B. lost; have seen
C. lose; have seen
D. lost; saw
低压带电作业和穿越低压带电线路的作业时，对工作人员的着装有什么规定？
