皮皮学，免费搜题
登录
搜题
【单选题】
根据连续性定理和伯努利定理可知,低速流体流过收缩管路时,密度( ),流速( ),压力( )。A.
不变，增大，减小
B.
不变，减小，增大
C.
减小、增大、减小
手机使用
分享
复制链接
新浪微博
分享QQ
微信扫一扫
反馈参考答案：
举一反三
【单选题】下列关于机械波的说法正确的是()
A.
有机械振动就有机械波
B.
机械波向右传播时右方的质点先振动
C.
机械波是传递能量的一种方式
D.
介质中的质点不随波迁移，只在平衡位置附近垂直于传播方向振动
【简答题】Listen to the beginning of each sentence. Circle the correct completion(s). There may be more than one correct answer. Select ALL the correct answers:
【简答题】S7-200PLC共有 个 定时 器,其中 的分辨率是 100ms.
【多选题】( 多选 ) 关于机械波的说法正确的是 ( )
A.
．相邻的质点要相互做功
B.
．机械波在真空中也能传播
C.
．波源开始时怎样振动，其他质点开始时就怎样振动
D.
．除波源外，波中各质点都做受迫振动
【单选题】Select the one of the following statements that is NOT CORRECT :
A.
Protein folding is assisted by intervention of specialized auxiliary proteins called chaperone.
B.
Protein folding tends to be modular, with areas of local secondary structure forming first, then coalescing into a molten globule.
C.
Protein folding is driven first and foremost by the thermodynamics of the water molecules surrounding the nascent polypeptide.
D.
The formation of S-S bond in a mature protein is facilitated by the enzyme protein disulfide isomerase.
E.
Only a few unusual proteins, such as collagen, require posttranslational processing by partial proteolysis to attain their mature conformation.
【单选题】以下关于机械波的说法正确的是（ ）
A.
机械波在传输过程中，频率有可能发生变化
B.
声波在空气里的传输速度比其在水中传输的要快
C.
机械波传播过程中，参与振动的介质并不传播
D.
机械波的周期与波源振动周期不相等
【单选题】Select the one of the following statements that is NOT CORRECT :
A.
Protein folding is assisted by intervention of specialized auxiliary proteins called chaperone.
B.
Protein folding tends to be modular, with areas of local secondary structure forming first, then coa
C.
Protein folding is driven first and foremost by the thermodynamics of the water molecules surroundin
D.
The formation of S-S bond in a mature protein is facilitated by the enzyme protein disulfide isomera
E.
Only a few unusual proteins, such as collagen, require posttranslational processing by partial proteolysis to attain their mature conformation.
相关题目：
参考解析：
知识点：
题目纠错 0
发布
