在“观察洋葱表皮细胞”的实验时,小敏发现视野上方较暗,下方较亮,她应该调节[ ]

题型:选择题

问题:

在“观察洋葱表皮细胞”的实验时,小敏发现视野上方较暗,下方较亮,她应该调节[ ]

A.反光镜

B.目镜

C.物镜

D.细准焦螺旋

考点:显微镜的构造和使用
题型:选择题

单词拼写:根据首字母或汉语提示,写出下列单词的正确形式。

1. The gloves were ______ (设计) for extremely cold climates.

2. You can't _______(忽略) the fact that Marie works harder than Jonny.

3. I've known Barbara for years. Since we were babies, _____(实际上).

4. I like the way you've ______(组织) the information in the report.

5. It's a terrible shame, in my o_______, that Jerry should jump the queue when getting on the bus.

6. Sally finds it really difficult to s_______ on £120 a week in London.

7. It's nice to see a f_______ face-I was afraid I wouldn't know anyone here.

8. They found themselves _______(竞争) with foreign companies for a share of the market.

9. Sally is an excellent teacher and she is h_______ thought of here.

10. There are still some d______ about whether she can finish the task on time.

题型:选择题

企业产品标准一般按企业的隶属关系报当地政府()备案。

A.标准化行政主管部门

B.省、自治区、直辖市

C.有关行政主管部门

D.国务院

题型:选择题

红、绛舌之成因是什么?

题型:选择题

使用官厅公式计算波浪参数时,在正常蓄水位和设计洪水位时,计算风速宜采用相应季节_____的最大风速;在校核洪水位时,计算风速采用相应洪水期______的最大风速:下列选项正确的是( )。

A.20年重现期 多年平均

B.多年平均 20年重现期

C.50年重现期 多年平均

D.多年平均 50年重现期

题型:选择题

为了保证增值税专用发票的安全使用,纳税人开具第一张专用发票的时间算起至 ( )天内要办理缴销手续。

A.15

B.45

C.60

D.120

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