按照《五金交电家电化工商品的购销合同实施办法》规定，供方错发到站、中转单位、收货单位

The nurse preparing to give a child an intramuscular injection chooses to give the injection into the gluteal muscle. The site is acceptable because which of the following reasons

A. The child has been walking for 1 year.
B. The child has small deltoid muscles.
C. The child is older than 2 years.
D. The child weighs more than 25 pounds.

A driver should ________ the road when _________.

A．concentrate on; drive

B．concentrate in; driving

C．concentrate to; drove

D．concentrate on; driving

两偏振片堆叠在一起，一束自然光垂直入射其上时没有光线通过。当其中一偏振片慢慢转动180°时，透射光强度发生的变化是（）。

A．光强单调增加

B．光强先增加，后又减小至零

C．光强先增加，后又减，再增加

D．光强先增加，后又减，再增加，最后减小为零

善于治疗胸痹的药物是( )

A．陈皮
B．青皮
C．香附
D．沉香
E．薤白

噪声控制标准criteria for noise control