已知:氢氧化镁能溶于浓度均为3mol/L的①盐酸②NH4Cl溶液③醋酸铵溶液(中

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问题:

已知:氢氧化镁能溶于浓度均为3mol/L的①盐酸②NH4Cl溶液③醋酸铵溶液(中性),下列说法正确的是(   )

A.c(NH4+):③ > ②

B.pH:① > ② > ③

C.Mg(OH)2溶于②的主要原因是由于NH4+水解使溶液显酸性,导致平衡Mg(OH)2(s) Mg2+ (aq) + 2OH- (aq)向溶解方向移动

D.等体积①和③混合溶液中 c(Cl) >c(NH4+) > c(H) > c(CH3COO) > c(OH)

考点:离子共存
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猪丹毒杆菌可致猪脾出现出()。

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Islamabad, Pakistan, June 22nd---Two mountain climbers surprisingly survived (幸免于) a fall of over 500 feet on the 25,530-foot mountain in Pakistan, Saturday. The two climbers were climbing an ice-covered wall of the mountain when they suddenly lost their footing and fell about 560 feet to a narrow snow-covered ledge(悬崖突出部分) below. “We were lucky that ledge was there,” said the climbers, “Otherwise, we would have fallen over 2,000 feet.” If the ledge had not been there, the two climbers almost certainly have met their death. “It’s a wonder,” the climbers said, “that we landed on the ledge, and the snow was loose enough to cushion(缓冲) our fall. We’re thankful that we survived.”

When a reporter asked them if they planned to give up mountain climbing after their narrow escape(九死一生), the two climbers replied, “Not at all. We’ll be going back up there just as soon as we get out of the hospital.”

小题1: The mountain climbers survived because _____.

A.they had fallen only 500 feet down

B.of the ledge and the loose snow on it

C.of their strong bodies

D.they were very good climbers小题2: If there had not been the snow-covered ledge, _____.

A.they wouldn’t have fallen down

B.they would have them wounded

C.they would have lost their lives

D.they would fall into the deep snow小题3: How high was the ledge from the foot of the mountain?

A.2,560 feet high

B.2,000 feet high

C.25,530 feet high

D.More than 1,400 feet high小题4: Choose the right order which shows what happened to the two climbers.

a. talked with a reporter           b. lost their footing 

c. was sent to a hospital           d. fell to a ledge     

e. started to climb an ice-covered wall

A.b-d-c-e-a

B.e-d-b-c-a

C.e-b-d-c-a

D.a-c-b-d-e

题型:选择题

出现卵巢囊肿蒂扭转时,正确的处理是()。

A.急症手术,回复扭转的肿瘤

B.急症手术,先钳夹肿瘤蒂部后切除肿瘤和蒂

C.行患侧肿瘤剥除术

D.改变体位帮助扭转缓解

E.行全子宫和患侧附件切除

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液力变矩器的传动功率()机械传动。

A、大于

B、小于

C、等于

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数值资料常见的频数分布的类型有()

A.正态分布和非正态分布

B.正态分布和正偏态分布

C.正态分布和负偏态分布

D.正偏态分布和负偏态分布

E.正态分布和偏态分布

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