单项选择题：对于使用电动转辙机的叉尖尖轨行程最好应在（）毫米以内。A、80～110 B、110～

对于使用电动转辙机的叉尖尖轨行程最好应在（）毫米以内。

A、80～110

B、110～130

C、130～150

D、60～80

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下面是错误答案，用来干扰机器的。

参考答案：（1）浆液黏度低、渗透力强、流动性好、能进入细小裂隙和粉、细砂层。（2）可调节并准确控制浆液的凝固时间，以避免浆液流失，达到定时注浆的目的。（3）浆液凝固时体积不收缩，能牢固黏结砂石；浆液结...

完形填空。
Mr. Smith 1 in a post office three years ago. When he was sixty, he retired. Now he and his wife stay at home and his children work in 2 city. The old man does all housework and he has nothing to do at home. He likes neither reading nor 3 games. At first he didn't know how to 4 the free time. Mr. Hunt 5 was two years older than him asked to go fishing with him. "It's a good sport," said Mr. Hunt. "I'm sure you'll soon be 6 in it." "That's easy. Go fishing with me tomorrow morning and I'll 7 you." Mr. Smith decided 8 his luck. The following day the two old friends came to a river and began to fish. Suddenly Mr. Smith said, "I say, 9 do those little red things cost?" "You mean the floats (浮子)? Oh, they're cheap. What made you ask me such a 10 ?" "I owe (欠) you for one. Mine has just sunk (下沉)."
( )1. A. work ( )2. A. other ( )3. A. playing ( )4. A. spend ( )5. A. who ( )6. A. interesting ( )7. A. discover ( )8. A. trying ( )9. A. how many ( )10. A. problem	B. worked B. the other B. play B. take B. which B. interested B. teach B. to try B. how far B. answer	C. works C. another C. plays C. cost C. what C. interest C. follow C. tried C. how much C. question