不属于电动机保护的是（）。 A.零序电流 B.电流速断 C.低电压 D.瓦斯

短文填空。

     A passenger told all air hostess (空姐) that he needed a cup of water to take his 1______ when the plane

just took off. She said to him, "I'll bring you the water 2______ ten minutes."

     Thirty minutes later, when the passenger ring for service sounded, the air hostess ran ill a hurry.She Was

so busy that she 3______ to bring him the water. As a 4______. the passenger couldn't take his medicine in

lime. The air hostess hurried over to him with a cup of wale. but he 5______ it.

     After a short while, the air hostess came up to him with a smile," Could you please tell me what I can do

for you, sir?" The passenger turned around without any words. The second time.also with a sweet smile,

"Would you like 6______ I can do for you?" Again the passenger refused.

    In the following hours 013.the flight, each time the air hostess passed the passenger, she would ask him

7______ a smile whether he needed some help or not. But the passenger never replied to her. When the

passenger was going to get 8______ the plane, he asked the air hostess to hand him the passenger's booklet

(小册子). She knew that he would write down terrible words about her job. 9______ still with a smile she

handed it to him.

     Getting off the plane. the air hostess opened the booklet, and smiled because the passenger wrote," How

can I refuse your twelve sweet 10______?"

下列对我国权利和义务关系的错误认识是                                       [ ]

A．没有无义务的权利，也没有无权利的义务    

B．公民在享受权利的同时，也就履行了义务    

C．权利和义务相互促进，相辅相成

D．公民在享受权利的同时必须履行义务

下列变化中，属于化学变化的是 [ ]

A．水结成冰

B．铁生锈

C．玻璃破碎

D．湿衣服晾干

中国晓辉公司与日本大合公司于2004年5月签订了购买3 500吨钢材的合同，由中国远洋公司的“东风”号将该批货物从日本神户运至宁波，“海神”号在途中遇小雨，因货舱盖不严使部分货物生锈。下列关于货物责任的选项正确的是__________。

A．大合公司应自行承担此项损失

B．晓辉公司应赔偿大合公司的损失

C．承运人可依海商法的规定主张免责，但应承担举证责任

D．承运人应赔偿货物锈损的损失

使用R600a代替CFC-12的冰箱必须改变的部件是（）。

A.压缩机

B.蒸发器

C.冷凝器

D.毛细管