对锚链上的标记进行检查的时间通常为（）。 A.每一航次 B.每半年 C.每次起锚时

研究结果的外部真实性较差的是

A．RCT
B．模型分析
C．人群研究
D．回顾性研究
E．WYP

下面哪项适用于渗透检验的复验？（）

A、复验应使用与原先相同的渗透检验材料

B、为提高复验的灵敏度最好使用荧光渗透剂进行复验

C、复验前需要用蒸汽除油法将被检物表面残留的渗透材料彻底清除干净

D、a和c

Generally speaking, a British is widely regarded as a quiet, shy and conservative person who is (1) only among those with whom he is acquainted. When a stranger is at present, he often seems nervous, (2) embarrassed. You have to take a commuter train any morning or evening to (3) the truth of this. Serious-looking businessmen and women sit reading their newspapers or dozing in a corner; hardly anybody talks, since to do so would be considered quite offensive. (4) , there is an unwritten but clearly understood code of behavior which, (5) broken, makes the offender immediately the object of (6) .

It has been known as a fact that a British has a (7) for the discussion of their weather and that, if given a chance, he will talk about it (8) . Some people argue that it is because the British weather seldom (9) forecast and hence becomes a source of interest and (10) to everyone. This may be so. (11) a British cannot have much (12) in the weathermen, who, after promising fine, sunny weather for the following day, are often proved wrong (13) a cloud over the Atlantic brings rainy weather to all districts! The man in the street seems to be as accurate — or as inaccurate — as the weathermen in his (14) .

Foreigners may be surprised at the number of references (15) weather that the British make to each other in the course of a single day. Very often conversational greetings are (16) by comments on the weather. "Nice day, isn’t it" "Beautiful!" may well be heard instead of "Good morning, how are you" (17) the foreigner may consider this exaggerated and comic, it is worthwhile pointing out that it could be used to his advantage. (18) he wants to start a conversation with a British but is (19) to know where to begin, he could do well to mention the state of the weather. It is a safe subject which will (20) an answer from even the most reserved of the British.

9（）

A.follows

B.predicts

C.defies

D.supports

春秋武士的起码要求是什么（）

A.勇武

B.有谋

C.勇敢杀敌

D.健康体魄