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【单选题】
过量最易引起心动过速、心室颤动的药物是A.
肾上腺素
B.
麻黄碱
C.
去氧肾上腺素
D.
多巴胺
E.
间羟胺
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举一反三
【单选题】Why is the latent period longer during an isotonic twitch of a skeletal muscle fiber than it is during an isometric twitch?
A.
Excitation-contraction coupling is slower during an isotonic twitch.
B.
Action potentials propagate more slowly when the fiber is shortening, so extra time is required to activate the entire fiber.
C.
In addition to the time for excitation-contraction coupling, it takes extra time for enough cross-bridges to attach to make the tension in the muscle fiber greater than the load.
D.
Fatigue sets in much more quickly during isotonic contractions, and when muscles are fatigued the crossbridges move much more slowly.
E.
The latent period is longer because isotonic twitches only occur in slow (Type I) muscle fibers.
【单选题】________is a kind of abbrevation by shortening longer words or phrases.
A.
Creation
B.
Acronym
C.
Clipping
D.
Blending
【单选题】信号 通过单位冲激响应是 的LTI系统, ,下列说法错误的是?
A.
求0＜t＜1时的y（t）时，卷积积分的积分区间为（0，t）
B.
如果对h（t）进行换元反转及时移操作，则卷积积分的被积函数是1+T-t
C.
当1＜t＜2时，
D.
当t＜0或t＞2时，y（t）=0
【单选题】Shortening a longer word by cutting a part off the original and using what remains is called ______.
A.
blending
B.
clipping
C.
acronymy
D.
back-formation
【多选题】中国共产党创建的历史特点是( )
A.
是一个区别于第二国际旧式社会改良党的新型工人阶级革命政党
B.
不存在欧洲那种工人贵族阶层，没有社会改良主义的基础
C.
所接受的，是没有被修正主义阉割的马克思主义的完整的科学世界观和社会革命论
D.
使中国革命有了科学的指导思想
【单选题】二阶常微分方程的初值问题的解
A.
是满足特定条件的解。
B.
是满足在初始点等于给定函数值及其导数值的解。
C.
是满足在初始点等于给定函数值的解。
D.
是方程的某一个解。
【单选题】Which of the following might be associated with a shortening working capital cycle?
A.
Lower net operating cash flow
B.
Increasing tax‐allowable depreciation expenditure
C.
Slower inventory turnover
D.
Taking longer to pay suppliers
【单选题】二阶常微分方程的初值问题的解是
A.
满足特定条件的解；
B.
满足在初始点等于给定函数数值及其到数值的解；
C.
满足在初始点等于给定函数值的解；
D.
方程的某一个解.
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