用Zn片、Cu片和稀硫酸组成的电池装置。下列有关该装置的说法不正确的是( ) A

SECTION C

Directions: Complete the following passage by filling in each blank with one word that best fits the context.

Baby survives after train hits pram

The CCTV footage (片段）shows a baby’s pram (婴儿车)rolling off a train platform as the mother makes a mad rush to save her son,   48   she is too late and it falls   49   the rails in front of an incoming train. This heart-stopping scene happened yesterday at Ashburton station in Melbourne, Australia. But the story has a   50   ending: the six-month-old baby survived with just   51   cut on his forehead, although the pram was dragged about 35 meters by the braking train. The nurse Jon Wright said the boy just “needed a feed and a sleep”.

“Luckily, he was strapped (绑) into his pram at the time, which probably saved   52  life. I think the child is extremely   53  ,” Wright told the Herald Sun newspaper after the baby was taken to hospital with minor injuries. The footage shows the mother taking her hands off the three-wheeled pram, which begins to roll   54 the platform edge. 

The driver put on the brakes   55   he saw the pram fall in front of him and fortunately the train was already slowing down to stop at the station. Rail firm Connex is to look into how the pram rolled off the platform. The accident came one day after Connex started a child safety awareness campaign warning parents to keep babies strapped into their prams at all times while on platforms.

The letter ______ three days ago and it ______ yesterday. [ ]

A. had post, had arrived

B. was posted, arrived

C. posted, arrived

D. had been posted, was arrived

配制一定质量分数的食盐溶液，主要实验步骤依次是（　　）

A．溶解，计算，称量

B．计算，溶解，称量

C．计算，称量，溶解

D．称量，计算，溶解

齿缝出血不痛不红微肿者多为

A．胃热伤络
B．肾火伤络
C．脾湿伤络
D．肺热伤络

催化蒸馏塔压力超高的原因有（）。

A、回流量低即回流比过小

B、塔顶冷凝器堵塞

C、塔釜再沸器漏

D、塔釜温度高