维生素B12100ug相当于（）。
A.0.01g
B.0.1ng
C.0.1g
D.10mg
E.0.1mg
参考答案：E
Your job here is only _____, for you will be removed from it when we have a proper post for you．
A．permanent
B．contemporary
C．temporary
D．fundamental
在公共场所附近开挖沟槽时，应设防护设施，夜间设臵照明灯和警示红灯
