从事道路危险货物运输的驾驶员、装卸管理员和押运员年龄不得超过50周岁。

实现下列变化时，需克服相同类型作用力的是：（　　）

A．金刚石和干冰的熔化

B．食盐和烧碱的熔化

C．液溴和液汞的气化

D．氨的气化和水的电离

下列情况中，需要对基本标准成本进行修订的是（）。

A．重要的原材料价格发生重大变化

B．工作方法改变引起的效率变化

C．生产经营能力利用程度的变化

D．市场供求变化导致的售价变化

One day, did not feeling well, Mr. Smith went to the hospital     1.____________

to have him examined. When he was given the test report,              2.____________

he was greatly shocked. “Am I dying?” He immediately                3.____________

was felt very ill. Filled with sadness, he went back home,              4.____________

taking a lot of pills and even wrote his will. “Maybe                  5.____________

a doctor made a mistake”, Mr. Smith thought and                          6.____________

went to the hospital to have more examination. To his                 7.____________

great joy, the doctor really made a mistake but he didn’t                8.____________

have cancer in all! Again, the whole world seemed beautiful.            9.____________

Mr. Smith went out for his favourite sport happily rather sadly.         10.___________

下述哪几种皮片属于断层皮片

A．表皮和真皮 * * 层

B．表皮和浅层真皮

C．表皮

D．表皮和真皮全层

E．表皮和部分厚度的真皮

在高温施工时，混凝土拌和物的初凝时间不得（）3h，否则应采取（）措施；低温施工时的终凝时间不得（）10h，否则应采取必要的（）措施。

A.大于；缓凝或保塑；小于；促凝或早强

B.小于；缓凝或保塑；大于；促凝或早强

C.小于；促凝或早强；大于；缓凝或保塑

D.大于；促凝或早强；小于；缓凝或保塑