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【多选题】
在使用keywords标签时,有哪些注意事项( )。A.
确认使用的关键词出现在网页文本中
B.
不要重复使用关键词
C.
每个网页的关键词应不同
D.
一个网页的关键词标签里应该包含3-5个最重要的关键词，不要超过5个
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反馈参考答案：
举一反三
【单选题】I walked slowly through the market,where people ______ all kinds of fruits and vegetables.I studied the prices carefully and bought what I needed.
A.
sell
B.
W ere selling
C.
had sold
D.
have sold
【简答题】Almost every day, we discuss the topic of health, especially for kids. But w hat is health? “Health” means eating well, getting enough exercise, and having a healthy weight. Here is some advice on hea...
【单选题】将零件浸入渗透液槽中施加渗透剂时
A.
在整个渗透时间内工件必须自始至终地浸在渗透液中
B.
浸渍时间至少为渗透时间的一半
C.
在浸渍时间内，只要保证零件表面全部覆盖渗透液即可
D.
浸渍时间不得超过5分钟
【简答题】阅读理解。 Ben's grandpa would retire after working for thirty-five years. Ben's parents were going to have a surprise party for him. Ben loved his granda and wanted to do something special for him. He rem...
【简答题】ZD6 型转辙机中的自动开闭器由静接点、 、 、速动爪、 组成,用来表示道岔尖轨所在位置。
【单选题】听力原文：W: This has been the worst flood for the past 20 years. It has caused much damage and destruction. All sectors suffered a lot from this huge disaster. M: Look at the prices of fruits and vegetabl...
A.
The effects of the flood.
B.
The prices of fruits and vegetables.
C.
The cause of the flood.
D.
Floods of the past twenty years.
【单选题】All kinds of vegetables on the market.
A.
can buy
B.
can be bought
C.
is bought
D.
w i ll buy
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