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【多选题】
关系模型的关系操作是通过关系语言实现的,下列对关系语言的特点描述,哪些是正确的?( )。
A.
是高度非过程化的语言
B.
用户不必用嵌套的方式来完成数据的操作任务
C.
用户不必请求DBA为他建立特殊的存取路径，存取路径的选择由DBMS的优化机制来完成
D.
用户不必求助于循环和递归来完成数据的重复操作
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参考答案：
举一反三
【单选题】A person with myasthenia gravis notes increased muscle strength when he is treated with an acetylcholinesterase (AChE) inhibitor. The basis for his improvement is increased
A.
Amount of acetylcholine (ACh) released from motor nerves
B.
Levels of ACh at the muscle end plates
C.
Number of ACh receptors on the muscle end plates
D.
degradation of ACh at cleft of neuromuscular junction
查看完整题目与答案
【单选题】A 42-year-old man with myasthenia gravis notes increased muscle strength when he is treated with an acetylcholinesterase (ACHE) inhibitor. The basis for his improvement is increased
A.
amount of acetylcholine (Ach) released from motor nerves
B.
levels of Ach at the muscle end plates
C.
number of Ach receptors on the muscle end plates
D.
amount of norepinephrine released from motor nerves
E.
synthesis of norepinephrine in motor nerves
查看完整题目与答案
【多选题】菜肴烹调工艺的关键控制点有( )
A.
原料的预处理
B.
烹调温度
C.
烹调时间
D.
保存条件
E.
后处理
查看完整题目与答案
【判断题】Hypertropy refers to the increased size of a muscle.
A.
正确
B.
错误
查看完整题目与答案
【单选题】Contractions called _____ occur whenever the forces applied to a muscle are increased, but the muscle does not appear to be moving.
A.
isotonic
B.
isometric
C.
tetanic
D.
summation contractions
查看完整题目与答案
【单选题】The amount of force produced by a skeletal muscle can be increased by
A.
Increasing extracellular Mg 2+
B.
Decreasing extracellular Ca 2+
C.
Increasing the activity of acetylcholine esterase
D.
Decreasing the interval between contractions
E.
Increasing the preload beyond 2.2 µm
查看完整题目与答案
【简答题】题9一19图所示两个相同的圆柱体，质量m=6．35kg，半径r=127mm，绳子连接如图所示。当t=0时将系统由静止释放。 试求： (1)在t=3s时圆柱体B的中心速度； (2)两个圆柱间绳子的拉力。
查看完整题目与答案
【单选题】如图9-30所示的MAN-B&W-S-MC/MCE主机操作系统中,管19的信号表示____。
A.
主机启动信号
B.
主机盘车机脱开信号
C.
主机换向完成信号
D.
主机停油控制信号
查看完整题目与答案
【单选题】塑料吸盘是家庭常用的小工具,小明做了如图 9-3-19 所示的实验,在实验中吸盘都保持静止,所挂钩码已是吸盘所能提起的最大物重,你认为下列说法中正确的是( )
A.
图甲中如果将塑料吸盘戳个小孔，吸盘仍能吸在墙面上
B.
图甲中大气对吸盘的压力等于钩码的重力
C.
利用图乙所示的实验可以粗略测量大气压强的值
D.
利用图乙所示的实验在海拔更高的地区仍能提起该重物
查看完整题目与答案
【单选题】如图19所示,编号为甲的房间应铺设几块预制板( )。
A.
3
B.
6
C.
9
D.
12
查看完整题目与答案
相关题目：
【单选题】A person with myasthenia gravis notes increased muscle strength when he is treated with an acetylcholinesterase (AChE) inhibitor. The basis for his improvement is increased
A.
Amount of acetylcholine (ACh) released from motor nerves
B.
Levels of ACh at the muscle end plates
C.
Number of ACh receptors on the muscle end plates
D.
degradation of ACh at cleft of neuromuscular junction
查看完整题目与答案
【单选题】A 42-year-old man with myasthenia gravis notes increased muscle strength when he is treated with an acetylcholinesterase (ACHE) inhibitor. The basis for his improvement is increased
A.
amount of acetylcholine (Ach) released from motor nerves
B.
levels of Ach at the muscle end plates
C.
number of Ach receptors on the muscle end plates
D.
amount of norepinephrine released from motor nerves
E.
synthesis of norepinephrine in motor nerves
查看完整题目与答案
【多选题】菜肴烹调工艺的关键控制点有( )
A.
原料的预处理
B.
烹调温度
C.
烹调时间
D.
保存条件
E.
后处理
查看完整题目与答案
【判断题】Hypertropy refers to the increased size of a muscle.
A.
正确
B.
错误
查看完整题目与答案
【单选题】Contractions called _____ occur whenever the forces applied to a muscle are increased, but the muscle does not appear to be moving.
A.
isotonic
B.
isometric
C.
tetanic
D.
summation contractions
查看完整题目与答案
【单选题】The amount of force produced by a skeletal muscle can be increased by
A.
Increasing extracellular Mg 2+
B.
Decreasing extracellular Ca 2+
C.
Increasing the activity of acetylcholine esterase
D.
Decreasing the interval between contractions
E.
Increasing the preload beyond 2.2 µm
查看完整题目与答案
【简答题】题9一19图所示两个相同的圆柱体，质量m=6．35kg，半径r=127mm，绳子连接如图所示。当t=0时将系统由静止释放。 试求： (1)在t=3s时圆柱体B的中心速度； (2)两个圆柱间绳子的拉力。
查看完整题目与答案
【单选题】如图9-30所示的MAN-B&W-S-MC/MCE主机操作系统中,管19的信号表示____。
A.
主机启动信号
B.
主机盘车机脱开信号
C.
主机换向完成信号
D.
主机停油控制信号
查看完整题目与答案
【单选题】塑料吸盘是家庭常用的小工具,小明做了如图 9-3-19 所示的实验,在实验中吸盘都保持静止,所挂钩码已是吸盘所能提起的最大物重,你认为下列说法中正确的是( )
A.
图甲中如果将塑料吸盘戳个小孔，吸盘仍能吸在墙面上
B.
图甲中大气对吸盘的压力等于钩码的重力
C.
利用图乙所示的实验可以粗略测量大气压强的值
D.
利用图乙所示的实验在海拔更高的地区仍能提起该重物
查看完整题目与答案
【单选题】如图19所示,编号为甲的房间应铺设几块预制板( )。
A.
3
B.
6
C.
9
D.
12
查看完整题目与答案
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