党的地方委员会进行换届选举前，一般应向上一级党组织作（）次书面请示。

质量保证体系的内容主要有( )。

A．项目质量目标

B．项目施工质量计划

C．思想保证体系

D．组织保证体系

E．进度保证体系

某孕妇宫内妊娠28周，双下肢水肿1周入院。既往高血压病2年，间断产检。10周前曾查血压140/90mmHg，尿蛋白(一)。入院查血压150/95mmHg，尿蛋白0．5克/24小时。其诊断为

A．不完全流产
B．稽留流产
C．难免流产
D．先兆流产
E．完全流产

下面哪一项不是药物结构修饰的目的（）.

A.降低药物成本

B.减少毒副作用

C.掩蔽药物的不良味道

D.提高药物的稳定性

E.延长药物的作用时间

在带电的电压互感器二次回流上工作，应注意安全注意事项什么？

In fall 2006, the National Basketball Association (NBA) started using basketballs made with synthetic, or man-made, material instead of leather. They made the change because they wanted every basketball they use to feel and bounce the same. Not all leather balls are exactly alike in weight or how they bounce, but the synthetic balls are.
However, some players complained right away that the new balls bounced differently and were actually harder to control than the leather ones.
Physics helped answer questions about why the new balls felt different. For example, the scientists studied friction, which in this case affects the ability of a player to hold onto a ball. "The greater the friction, the better it will stick to his hand," explains a scientist.
Tests on both wet and dry balls showed that while the synthetic ball was easier to hold onto when dry, it had less friction and became much harder to hold onto when wet. That’s because sweat stays on the surface of the synthetic balls but gets taken into the leather balls.
The scientists also tested bounce and found that the logo printed on the new balls made their surface uneven and caused them to bounce a little strangely compared with the leather balls.
In January, the NBA went back to using the leather balls. They aren’t perfect, but for now, that’s just the way the ball bounces.

Why were the synthetic balls expected to be used in NBA according to the text

A．Because they are easier to control.

B．Because they waste less material.

C．Because they look exactly alike.

D．Because they feel and bounce alike..