单层钢结构安装工程中，不得在其上焊接悬挂物和卡具的构件有（）。A.吊车梁受拉翼缘 B

牙震荡主要损伤()

A．牙龈

B．牙本质和牙槽骨

C．牙周膜

D．牙髓

E．牙周膜和牙髓

在我国的进口业务中，多数情况下所采用的结算方式是（）。

A.商业票据结算

B.现金结算

C.进口押汇结算

D.信用证结算

根据句意及首字母提示，完成下列单词的拼写。

1. The park is c______ to the school.

2. It's a long d______ from Beijing to Fujian.

3. The computer is too expensive. I don't have e______ money to buy it.

4. Guangzhou is in Guangdong P______.

5. Doing chores at home all day is very d______.

It was the building of the rail network from the west to the east coast ________ brought even larger numbers to California in the 1860s.

A．that

B．what

C．how

D．which

读图，完成下列各题。

图中①②③④附近河水流速最快的是（）

A.①

B.②

C.③

D.④