伴三凹征的呼吸困难，出现于下列哪种情况（）

口唇发绀，吸气时出现“三凹征”，应考虑为（）

何谓"三凹征"？发生机制是什么？

Where would you find the call sign or call letters of the radio station on your ship?（）

三凹征（three depression sign）

The Great Charter(or Magna Carta)was signed by King John at Runnymede in（）

In time charter-party，（）is to indemnify the owners against all consequences or liabilities arising from the master signing bills of lading or otherwise complying with such orders.

In each cylinder cover there are two or three holes for （）

Sign up for alerts（）your mobile phone or email.

我们经常在搜索时使用组合关键词来提高检索的效率，下列表达式中，具有相同搜索效果的是（）。 ①深圳夜景 ②深圳OR夜景 ③深圳-夜景 ④深圳+夜景

Content filtering enables traffic to be permitted or blocked based on inspection of which three types of content?（）(Choose three.)

The ball _____ two or three times before rolling down the slope.