下列哪项内容不是紧闭循环装置的组成部件（） A.新鲜气流入口，呼气和吸气导向活瓣 B

单词拼写(共10小题；每小题1分，满分10分）

56. His long illness and ___________(由此引起的)absence put him far behind in his work.

57.You must try to _______________（集中）your mind on work and study

58. The boys _______________（打算、尝试）to leave for camping but were stopped by their parents.

59. He spends all his spare time in collecting stamps and we all say that he is a___________ to collecting stamps.

60.People can easily become ______________(智力上) addicted to drugs when they start taking   them.

61.To our sorrow, many children have to __________ (停止)school because of the lack of money. .

62. She hopes to get a job on the local newspaper and ______________(最后) work for the Times.

63. He t_____________ the speech from Spanish into English.

64. The company’s head office is in the city, but it has b________ all over the country.

65. John was touched by the w_____________ of their welcome.

周老先生用多年积蓄盖了5间平房，与老伴、儿子及儿媳共住，产权人是周老先生。因修机场拆迁，老周得到60多万元补偿款。他在市里买了一套房，让大家继续住，但产权人仍然是周老先生自己。因儿媳与儿子不和，所以不久前，儿媳忽然向法院起诉公公、婆婆，要求公婆给自己30万元拆迁补偿款。据此该房屋产权应当是( )。

A．周先生自己的

B．周先生和儿子的

C．儿子与儿媳的

D．周先生与儿子儿媳共有的

19世纪中叶，发现元素周期律的化学家是(    )

A．居里夫人

B．侯德榜

C．门捷列夫

D．道尔顿

简述铁合金牌号的表示方法。

机械敷设电缆时，对于铜芯电缆，当牵引导体时，允许牵引强度为（）。

A.40N／mm²；

B.70N／mm²；

C.50N／mm²；

D.80N／mm²；