直流保护配置的几条原则（）。A.可靠性 B.快速性 C.灵敏性 D.安全性

酒精对水蚤心率的影响：实验室常用体积分数为95%的酒精配制不同浓度的酒精溶液．学生在实验时配制如下的不同浓度梯度的酒精：1%、3%、5%、8%、10%、15%、20%等．在15℃左右的室温中经过大量的实验，并在实验中选择10秒内水蚤跳动范围在30～36次之间的成年水蚤为材料，经过多次实验得到以下平均数值．现将在不同酒精浓度梯度下的水蚤在10秒内的心脏跳动次数列表如下：根据上述实验结果，回答下列问题：

酒精浓度	清水	1%	3%	5%	8%	10%	15%	20%
10秒内心脏跳动次数	33	30	28	24	22	21	18	死亡

将以上数据转换为如图所示的图表：

（1）上述图表表明，水蚤心率很容易受到______的影响，即水蚤心率会随着酒精浓度的增加而______．

（2）当酒精的体积分数达到20%时，水蚤会因为酒精浓度过大而导致______．分析其原因，就很容易得出，酒精具有______作用，所以会减缓心脏的跳动．

该患者首先考虑的诊断可能是

A．子宫内膜癌
B．子宫颈癌
C．卵巢肿瘤
D．输卵管癌
E．子宫肌瘤

Egyptian wine has an extensive history within the history of Egyptian civilization. Grapes were not (1) to the landscape of Egypt, rather the vines themselves are (2) to have been imported from the Phoenicians, (3) the actual origins remain in (4) . What is known, is that (5) the third millennium BC, Egyptian kings of the first (6) had extensive wine cellars, and wine was used extensively in the temple ceremonies. The main (7) of wine in Egypt, took place between the king, nobles, and the priests in temple ceremonies, and is (8) by numerous painted relief’s, and other (9) evidence. The vineyards of ancient Egypt, were quite different from the modern methods of wine making today. (10) viticulture ( or wine making), ceased to (11) an exclusively ceremonial purpose, the Egyptians began to experiment with simple structures for their vines to train on, (12) found a way to train their vines so they were easy low (13) bushes, and found ways for the soil to (14) more moisture for the vines. Egyptian wine making experiments included the use of different wine presses, adding heat to the must ( the grape juice ready for fermentation) (15) make the wine sweet, and differences in vat types and materials. The (16) finished product of wine, was poured through a cloth filter, and then into earthenware jars, (17) they would be sealed with natural tar and left to (18) . The Egyptians kept accurate records of their vintages, and (19) of their wines, each jar of wine was clearly (20) with it’s own vintage, and quality.

16（）

A.final

B.end

C.eventual

D.ultimate

经正常使用过的轴向柱塞泵工作压力达不到要求最常见的原因是（）.

A.容积效率变低

B.机械效率变低

C.转速变低

D.轴封失效

团体旅客中有分别乘坐座、卧车或成人、儿童同一团体时，按其中（）的免收。

A.票价低

B.票价高

C.席别高

D.席别低