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【单选题】
引起菌群失调最主要的原因是A.
生态制剂的大量使用
B.
正常菌群的遗传特征明显改变
C.
抗生素的大量使用
D.
正常菌群的增殖方式明显改变
E.
免疫抑制剂的使用
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【单选题】_____ should not become a serious disadvantage in life and work. A. To be nottall B. Not being tall C. Being nottall D. Not to be tall
A.
To be nottall
B.
Not being tall
C.
Being nottall
D.
Not to be tall
【单选题】设有一熟练工人，用4种不同的机器在6种不同的运转速度下生产同一种零件。在单位时段内生产的零件数见表:速度1速度2速度3速度4速度5速度6机器142.539.339.639.942.943.6机器239.540.140.542.342.543.1机器340.240.541.343.444.945.1机器441.342.243.544.245.942.3判断运转速度的检验统计量为（）。
A.
2.901
B.
5.317
C.
3.287
D.
3.391
【简答题】设有一熟练工人，用4种不同的机器在6种不同的运转速度下生产同一种零件，同在单位时段内，生产的零件数如表1.4所示．试分析机器、运转速度对产量有无显著影响(α=0.05)． 表1.4 说明：小数点后的数是根据最后一个零件完成的程度定出的．
【简答题】Spot Dictation (5 points, 1 point each) Directions: Listen to the recording and fill in the blanks with the exact words you hear. 1. Some people are coming to a to actually buy something on that da...
【简答题】 Fill in the blanks withthe following phrases: 1.meanto 2.be adorned with 3. be noted for 4.a memorial for 5. have one’s own picturesque charm 1.Jiangxi for Jinggangshan, an ideal...
【单选题】Rain forests _____and burmed at such a speed that they will disappear from the earth in the near future. A. cut B. are cut C. are being cut D. had been cut
A.
1
B.
2
C.
3
D.
4
【简答题】II. Work out the meaning of each of the following words from the context in which it appears by ticking off the best choice. 1. TOUCH in excerpt 2 probably means A. feel B. Shine C. contact 2. D...
【简答题】语态练习 1. The structure of aircraft _________ all the time. A. is being changed B. has been changed C. is being changing D. had changed 2. In 1950, she was the largest ship that ________. A. was ever bu...
【单选题】设有一熟练工人,用4种不同的机器在6种不同的运转速度下生产同一种零件。在单位时段内,生产的零件数见下表。 速度1 速度2 速度3 速度4 速度5 速度6 机器1 42.5 39.3 39.6 39.9 42.9 43.6 机器2 39.5 40.1 40.5 42.3 42.5 43.1 机器3 40.2 40.5 41.3 43.4 44.9 45.1 机器4 41.3 42.2 43.5 44...
A.
16.378
B.
42.808
C.
24.152
D.
83.338
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