甘味药物的主要作用是（）
A.行气、活血
B.收敛、固涩
C.补益、缓急
D.软坚、散结
E.燥湿、通泄
参考答案：C
There is a great danger if the driver has been drinking alcohol or taking drugs, or _____ by speeding or breaking down traffic laws.
A．showing off
B．showing around
C．showing up
D．showing in
DL1M方形筒灯的IP等级是：（）
A.IP20
B.IP54
C.IP65
D.IP67
