两个数相减，如果减数增加0.3，被减数不变，差[ ] A．增加0.3 B．减少0

卡托普利抗心衰作用的机制是

A．增加去甲肾上腺分泌

B．减少前列腺素合成

C．拮抗钙离子的作用

D．减少血管紧张素2的生成

E．增加心肌耗氧量

在群落调查中，某物种出现的样方数占调查总样方数的百分比，即为该物种在该群落中的______。

救生筏用于水上迫降时撤离旅客，机上配备的救生筏为六角型（称圆形船）折叠后装入带有搬运手柄的包装袋中，下面说法错误的是（）

A.使用时无需打开包装袋上的扣绳

B.救生筏有正反面

C.连接绳在包装袋上一块颜色鲜明的盖布下

D.救生包系在展开的救生筏上撤离是一定将其拉入救生筏

WAP uses (71) , which includes the Handheld Device Markup Language (HDML) developed by Phone.com. WML can also trace its roots to eXtensible Markup Language (XML). A markup language is a way of adding information to your (72) that tells the device receiving the content what to do with it. The best known markup language is Hypertext Markup Language. (73) HTML, WML is considered a meta language. Basically, this means that in addition to providing predefined (74) , WML lets you design your own markup language (75) . WAP also allows the use of standard Internet protocols such as UDP, IP and XML.

（71）处填（）。

A．HTML

B．XML

C．DML

D．WML