某钢筋混凝土管桩，外径0.55m，内径0.39m，混凝土强度等级为C40，主筋为HP

用词、短语或句子补全对话。

Mei:  Mom, my American friend, Mary, invited me to dinner this evening.

Mother:  Really?1.________?

Mei:  Seven.  I'm afraid I have to go now.

Mother:  2. ________.  It's only five thirty.  You still have one and a half hours

         left. Besides, her home 3. ________ from here.

Mei:  Maybe I should get there early, or she will be worried.

Mother:  You know, in the USA, people go to dinner neither too late nor too early.

              You should 4,________ there at about seven.

Mei:   I see.  What do you think I should bring with me?

Mother:   You don't need to take anything.  If you like, you can 5________.

    Mei:  Do you think only flowers are enough?

Mother:  Of course. That's pretty good.

2010年9月22日，中央电视台“芜湖月·中华情”中秋晚会在芜湖成功举办。晚会通过CCTV-1、CCTV-4、CCTV-9三大频道同时并机直播，观众在家中选择不同频道观看电视直播时，实际上是在改变

A．电视台发射的电磁波的波速

B．电视机接收的电磁波的波速

C．电视台发射的电磁波的频率

D．电视机接收的电磁波的频率

某密闭容器中充入一定量SO_２、O₂，发生反应2SO_２＋O₂2SO_３，测得SO_３浓度与反应温度关系如图。下列说法正确的是  (    )

A．该反应AH>0

B．SO_２转化率：a＞ｂ＞c

C．化学反应速率：c>ｂ>a

D．平衡常数K：ｂ>c＞ａ

男，36岁，头痛，癫痫，CT示脑实质多数高密度点状影和0.5～1cm圆形低密度灶，呈环形增强，诊断为（）。

A.多发性硬化

B.脑脓肿

C.结节性硬化

D.脑囊虫病

E.病毒性脑炎

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