下述哪项不是二尖瓣狭窄的体征（）. A.舒张期叹气样杂音 B.第一心音亢进 C.舒张

德意志帝国宪法与美国1788年宪法相比，最大的不同在于（）

A民主化程度

B宪法的阶级性质

C内容的全面性

D实施程度

Dear Sir,

I have to travel every day from So UK Road to the airport. Two buses travel along this route: No.49 and No.16. However, by the time No.16 reaches So UK Road, it is always full.   小题1:   

The timetable states that there are buses from So UK Road to the airport every ten minutes.

  小题2:   The instructions state that if there are empty seats on a bus, the bus must stop at every stop where people are waiting.    小题3:  

The instructions state that no bus may carry more than 40 seated passengers and 20 standing passengers. Yesterday, I was the first to get off the bus when it reached the airport.   小题4: There were 129 of them.

Clearly printed on the back of every bus is a sign that says “Maximum speed: 50mph.” 小题5:  

Saturday morning a No. 49 bus traveled the distance in ten minutes, at an average speed of 60 mph. At times it must have done at least 80 or even 90 mph.

It is obvious that our bus companies have neither respect for the instructions nor consideration for their passengers. Can nothing be done about this?

A．I counted the other passengers as they got off.

B．Is there anything we can do to change this?

C．The problem is that we have to pay more for our trip.

D．The distance from So UK Road to the airport is 10 miles.E. This leaves No.49 which sometimes has empty seats on it.

F. If this is so, why do I have to wait half an hour for a bus nearly every day?

G. Why is it that half-empty buses go straight past me when I am standing at the bus stop? 

什么叫视图，什么叫三面视图

患者，男性，40岁。间歇性上腹痛3年，近日出现呕吐，吐后自觉舒适，吐物有酸臭味。查：上腹饱满，有振水音，诊断可能为（）

A.消化性溃疡并幽门梗阻

B.十二指肠淤滞症

C.胃癌

D.急性胃炎

E.神经性呕吐

用于扑灭飞机内部着火的三种灭火剂是（）

A.水、干化学制品、四氧化碳

B.水、干化学制品、二氧化碳

C.水、甲基溴化物、碳粉