【简答题】写出判断“三条线段a,b,c构成三角形”的表达式________ 。
【单选题】克隆羊多莉的诞生过程如图所示,该事实说明( )
【单选题】多利的诞生过程如图所示,该事实说明 [ ]
【单选题】In that country, a person who marries before legal age must have a parent's ______ to obtain a license.
【单选题】Consider a system excited by a periodically changing external load. Which one of the following is true?
A.
The amplitude of the displacement response can be reduced if the mass becomes smaller.
B.
The response becomes larger if the excitation frequency is increased.
C.
Severe vibration takes place as the excitation frequency comes close to one of the system’s natural frequencies.
D.
There is nothing one can do to turn down the vibration scale because it is a random function of time.
【单选题】The legal age to drink in America is _____________.
【单选题】下列说法不正确的是:
B.
细胞癌变,与细胞内遗传因素有关,许多致癌物质,它改变了细胞核内的物质
C.
动物细胞和植物细胞都有细胞膜、细胞质、细胞核
【多选题】为什么“我”会为母亲卖白菜的决定而哭?
A.
因为那三棵白菜原是准备留着过年包饺子的,在那个极端贫困的家庭,这是一个小孩子最大的盼望。
D.
因为这些白菜是我和母亲亲手种植、侍弄的,我对这些白菜有着深厚的感情。