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【多选题】
有关乳糖操纵子描述正确的是(    )
A.
没有半乳糖存在时处于阻遏状态
B.
半乳糖存在时可能处于表达状态
C.
有高浓度半乳糖、低浓度葡萄糖存在时处于表达状态
D.
有半乳糖存在时处于阻遏状态
E.
没有半乳糖存在时处于表达状态
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【简答题】腐蚀是指金属材料在周围介质的作用下发生破坏,按腐蚀机理分为物理腐蚀、 ____腐蚀和电化学腐蚀,按破坏特征可分为____和____腐蚀
【多选题】下列反映材料与水有关的性质指标有( )
A.
软化系数
B.
吸水性与吸湿性
C.
吸水率与含水率
D.
抗渗等级与抗冻等级
E.
抗渗性与抗冻性
【单选题】— Daniel, can you help me ______?   — Sure. Where’s the brush?
A.
paint the wall
B.
move the boxes
C.
mail the letters
D.
turn off the light
【单选题】听力原文:W: If you can help me paint the bookshelf and the table this morning, we can go to the beach this afternoon. M: I'm not very good at painting, but if you like I'll wash the ear instead. What is t...
A.
Go to the beach.
B.
Fix the table.
C.
Paint the bookshelf.
D.
Wash the car.
【单选题】地理区域组织模式最严重的问题是:
A.
销售人员必须销售整个产品线,而他们不一定对所有产品都足够了解
B.
很难设立合理的区域性机构
C.
它常会导致大量的出差时间
D.
这通常是最昂贵的选择
E.
销售人员通常不喜欢这种方式
【单选题】在直流发电机中电枢绕组中的电动势E与电刷两端的电压U的关系为( )
A.
U=E
B.
E>U
C.
E
D.
E=2U
【多选题】下列反映材料与水有关的性质指标有( )
A.
软化系数
B.
吸水性与吸湿性
C.
吸水率与含水率 E、抗渗等级与抗冻等级 F、抗渗性与抗冻性
【单选题】A: OK, if I call on you to paint the room tomorrow? B: ___________ . Which one of the following statements is wrong?
A.
Nice thought, but that would be too much bother.
B.
No, don't bother, I can manage.
C.
Please don't trouble about it.
D.
No,you bother me.
【单选题】On the show, you can pay£5 for______.
A.
taking a photo with an artist
B.
getting a hand painted T-shirt
C.
talking with a famous artist
【简答题】口译听力练习1 填空题 I n some western countries, there are many _____ 1 ________ for s who want to improve their lives. T here are public schools you ______ 2 ________. I n the schools, you can find clas...
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