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【单选题】
在一个固定体积的密闭容器中，放入3L X(g)和2L Y(g)，在一定条件下发生下列反应：4X(g)+3Y(g) 2Z(g) +nR(g)，达到平衡后，容器内温度不变，混合气体的压强比原来增加5%，X的浓度减少1/3， 则该反应方程式中的n值是 [ ]A.
3
B.
4
C.
5
D.
6
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举一反三
【单选题】Questions 8 to 11 are based on the conversation you have just heard.
A.
To confirm an urgent appointment.
B.
To collect a package from the woman.
C.
To ask the woman to sign a document.
D.
To arrange the delivery of a package.
【单选题】8 Questions 8 to 11 are based on the conversation you have just heard.
A.
The dinosaur age.
B.
Prehistoric bacteria.
C.
The cause of climate change.
D.
The cause of mass extinctions.
【单选题】Questions 8 to 11 are based on the conversation you have heard.
A.
He will be kept from promotion.
B.
He will go through retraining.
C.
He will be given a warning.
D.
He will lose part of his pay.
【单选题】糖皮质激素对血细胞的影响是
A.
红细胞数量增加，中性粒细胞减少，淋巴细胞增多
B.
红细胞数量减少，中性粒细胞增多，淋巴细胞增多
C.
红细胞数量减少，中性粒细胞减少，淋巴细胞减少
D.
红细胞数量增多，血小板数量增加，淋巴细胞减少
E.
红细胞数量减少，血小板数量减少
【单选题】8 Questions 8 to 11 are based on the conversation you have just heard.
A.
Visit a famous town.
B.
Attend a school party.
C.
See the woman’s friend.
D.
Eat at a pizza restaurant.
【单选题】Questions 8 to 11 are based on the conversation you have just heard
A.
He's explaining the language laboratory.
B.
He wants to know where the tapes are.
C.
He's showing her a new tape recorder
D.
He's recording her voice on a tape.
【单选题】糖皮质激素对血细胞的影响是
A.
红细胞数量增加、中性粒细胞减少、淋巴细胞增加
B.
红细胞数量减少、中性粒细胞数量增加、淋巴细胞增加
C.
红细胞数量减少、中性粒细胞减少、淋巴细胞减少
D.
红细胞数量增加、血小板数量增加、淋巴细胞减少
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