润滑油过滤器的切换步骤中，说法正确的有（）。A、备用过滤器处于备用状态 B、慢慢的旋

拟诊上颌窦积液的患者应首选的摄影位置是（）

A.俯卧瓦氏位

B.站立瓦氏位

C.汤氏位

D.柯氏位

E.头颅侧位

关于腱鞘，正确的是（）

A.套在短肌表面的鞘管

B.存在于活动性较小的部位

C.由滑膜层和纤维层构成

D.腕部不存在腱鞘

E.纤维层位于深面

投资基金的风险小于股票投资，大于债券投资。( )

根据短文内容，从短文后的选项中选出能填入空白处的最佳选项。选项中有两项为多余选项。

     We are all called upon to make a speech at some point in life, but most of us don't do a very good

job.    1   .

     So, you have to give a speech-and you are terrified. You get nervous, you forget what you want to

say, you stumble (结结巴巴) over words, you talk too long, and you bore your audience. Later you think,

"Thank Goodness, it's over. I'm just not good at public speaking. I hope I never have to do that again."

     Cheep up!    2   . Here are some simple steps to take the pain out of speech making. Ask yourself the

purpose of your speech. What is the occasion? Why are you speaking? Then, gather as many facts as you

can on your subject. Spend plenty of your time doing your research. Then spend plenty of your time

organizing your material so that your speech is clear and easy to follow. Use as many examples as possible,

and use pictures, charts, and graphs if they help you make your points more clearly.     3   . Don't talk over

their heads, and don't talk down to them. Treat your audience with respect. They will appreciate your

thoughtfulness.

     Just remember: Be prepared. Know your subject, your audience, and the occasion. Be brief.    4   . And

be yourself. Let your personality come through so that you make person-to-person contact with your

audience.

     If you follow these simple steps, you will see that you don't have to be afraid of public speaking. In

fact, you may find the experience so enjoyable that you volunteer to make more speeches! You're not

convinced yet?    5   .

A. It doesn't have to be that bad.

B. Take several deep breaths before your speech.

C. This article gives some advice on how to give a good speech.

D. Say what you have to say and then stop.

E. Don't say what you aren't familiar with.

F. Never forget your audience.

G. Give it a try and see what happens.

规准仪法适用于测定（）使用的4.75㎜以上的粗集料的针状及片状颗粒含量，以百分率计

A.水泥混凝土

B.沥青混合料

C.底基层

D.基层