下列不属于动态评价方法的是（）。 A.净现值 B.净年值 C.增量内部收益率 D.增

宪法对统治权的作用主要表现为（）。

A.确认、维护和巩固国家权力

B.规范国家权力有效运行

C.防止滥用国家权力

D.决定国家权力

男性，56岁。阵发性胸闷、气促2年，加重并双下肢水肿4天就诊。心电图示窦性心律，心率60次／分，一度房室传导阻滞伴完全性右束支传导阻滞，超声心动图示全心扩大，诊断为扩张型心肌病，心功能不全。入院后予以地高辛、呋塞米口服及硝酸甘油静滴治疗。第5天突然神志不清，抽搐，血压为OkPa，听诊心音消失。心肺复苏后神志清醒，心跳恢复，心率48次／分，并有频发室性期前收缩。

患者神志不清，抽搐应考虑为（）

A.癫痫

B.脑血管意外

C.阿-斯综合征

D.短暂性脑缺血

E.心源性休克

Why did they keep trying _________ they must have known it was hopeless?

A．if

B．because

C．when

D．whether

孕妇禁用糖皮质激素的主要原因是（）

A.升高血压

B.升高血糖

C.向心性肥胖

D.致畸胎

E.肌肉萎缩

The great advance (91) rocket theory 40 years ago showed that liquid-fuel rockets were far (92) in every respect to the skyrocket with its weak solid fuel, the only kind of rocket then known. (93) , during the last decade, large solid-fuel rockets with (94) fuels about as powerful as liquid fuels have (95) their appearance, and it is a favorite layperson’s question to (96) which one is "better". The question is meaningless. (97) might as well ask whether a gasoline or a diesel engine is "better". It all (98) on the purpose. A liquid-fuel rocket is complicated, (99) has the advantage that it can be controlled beautifully. The burning of the rocket engine can be stopped completely; it can be reignited when (100) . (101) , the thrust can be made to vary by adjusting the speed of the fuel pumps. A solid-fuel rocket, on the other hand, is rather (102) in construction, (103) hard to build when a really (104) size is desired. But once you have a solid-fuel rocket, it is ready for action (105) very short notice. A liquid-fuel rocket has to be fueled first and cannot be (106) readiness for very long after it has been fueled. (107) , once a solid-fuel rocket has been ignited, it will keep burning. It cannot be stopped and reignited (108) desired (it could conceivably be stopped and reignited after a pre-calculated time of burning has elapsed, and its thrust cannot be varied. Because a solid-fuel rocket can be kept ready for a long time, most military missiles (109) solid fuels, but human-piloted spaceflight needs the fine adjustments that can (110) be provided by liquid fuels.

A．basic

B．elementary

C．easy

D．simple