下列属于机车膨胀水箱水位升高的原因是（）。A、中冷器漏B、燃油热交换器漏C、气缸套裂

根据上下文，在空白处填正确的内容，使短文意思完整语句连贯。

      When you 1_________ (发信) or a postcard, you have to put stamps on the envelope or on the card.

When did people first begin to use stamps? Who was the first to 2_________ (想到) this idea? In the early

3_________(十九世纪), people didn't use stamps. They had to pay postage when they 4__________

(收到) it. Sometimes they didn't want to receive a letter 5__________ (根本不) but they had to pay money

for it. They were unhappy about this. The postage was high 6__________ (在那时), because the post

offices had to send many people to get the postage. Rowland Hill was a school teacher in England. He was

the first to think of using stamps in the 1850s. He thought it would be 7__________ (容易得多) for people

to use the stamps. They could to the post office to buy stamps and 8__________ (把它们贴在……上) the

envelops before they sent the letter. The post office could just put marks on the stamps 9__________ (以便)

people could not use the stamps again.10__________ (用这种方法) the post office did not need to send

postman to get postage. It only needed fewer postman to send letters.

1._______ 2._______ 3._______ 4._______ 5._______

6._______ 7._______ 8._______ 9._______ 10._______

补全对话，每空一词。

A: Who is (1)_______(2) _______today?

B: (3) _______am.

A: (4) _______we all here?

B: No.

A: (5) _______isn't at school today?

B: Zhang Qiang.

A: (6) _______is he?

B: I (7) _______know. But I think he's (8) _______ (9)_______. He looks (10) _______his father.

A: I see.

1._____ 2._____ 3._____ 4._____ 5._____

6._____ 7._____ 8._____ 9._____ 10._____

煤矿井下对管状局部接地极规格怎样要求的？如何安装？

MRI的成像具有哪些方面的优势?

下列选项中，不属于砌筑砂浆的是（）。

A.水泥砌筑砂浆

B.普通砌筑砂浆

C.水泥混合砌筑砂浆

D.预拌砌筑砂浆