以下作业属于高风险作业的有（）。 A.登高作业 B.动火作业 C.进入狭小空间 D.

某航空公司为船舶A投保运输工具保险100万元，按国内惯例投保定期保险一年，向某保险公司交纳保险费5000元，在一次航行中，船舶A与外国船舶B相撞，据估计A船损失10万元，B船损失20万元。

若该次碰撞是互有过失碰撞，按“单一责任”计算方法，则A船舶保险公司应赔偿（）元。

A.10万

B.15万

C.20万

D.30万

阅读短文，判断正(T)误(F)。

      I think the most terrible thing in life for my little brother is getting up in the morning. He is almost sick when

my mother calls, "Herbert! It's seven o'clock! Get up!"

      Herbert answers, "I'm coming!" and goes right back to sleep. I'm not at all like my brother. I don't like to go

to bed at night but I don't mind getting up in the morning. I usually wake up before my mother calls me. I jump

out of bed and go into the bathroom to take a shower. I get dressed, brush my teeth, comb my hair, and get

ready to go downstairs for breakfast as soon as my mother calls.

      But not Herbert. He just sleeps. A military band (军乐队) in our bedroom could not wake him up. I call him

and say, "Get up! Mum will be up here to pull you out of bed if you don't get up immediately!"

      But he just sleeps. After calling a few more times my mother has to come upstairs and pull Herbert out of

bed. It's that way every day with my little brother. Perhaps some day he'll learn to get up on time, but I really

don't think so.

( ) 1. The most terrible thing in life for my little brother is going to school.　

( ) 2. I'm not like my brother because I like to go to bed early at night and get up early in the morning.

( ) 3. I usually jump out of bed and go into the bathroom for a shower before my mother calls.

( ) 4. When mother calls, Herbert doesn't answer and remains in bed.

( ) 5. My mother often has to go upstairs and pull Herbert out of bed as he refuses to get up.

( ) 6. Sometimes we have to send for a military band to wake Herbert up.

( ) 7. The writer thinks some day Herbert will learn to get up on time.

给你一把钢锯条，你能做哪些声学实验？简要说明过程（举二例）

慢性肾功能衰竭后期病人，一旦出现下列哪种情况提示病情严重()。

A．少尿、高血钾

B．中度贫血

C．乏力、食欲减退

D．水肿、低钠血症

E．呼气有尿臭味

6073004508省略亿位后面的尾数约是（    ）亿。