【单选题】当截面上同时作用有剪应力和正应力( )
A.
剪应力降低了混凝土的抗拉强度,但提高了其抗压强度
【单选题】蛋白质在紫外光谱区有特征性吸收峰,以下说法错误的是
A.
蛋白质之所以可以吸收紫外线,是因为具有芳香族氨基酸:酪氨酸和色氨酸
C.
蛋白质在280nm处的光吸收值和浓度成正比关系
【单选题】What will Maurice show Marie?
A.
How to use the dishwasher
C.
How to fold the clean clothes
D.
How to arrange the furniture
【单选题】蛋白质不能吸收可见光,但能吸收一定波长范围内的紫外光。大多数蛋白质在280nm波长附近有一个吸收峰,这主要与蛋白质中( )的紫外吸收有关。因此,可以利用紫外吸收法,根据蛋白质溶液在280nm波长的吸收值测定蛋白质浓度
【单选题】In 1954, Richard and Maurice
A.
ran a hamburger restaurant.
B.
didn't like milkshakes.
C.
prepared the food by hand.
【单选题】听力原文:W: You know, Maurice, coffee is soon going to be in short supply. M: Why don't we have some in store then? Maurice is most probably going
【简答题】Maurice gives advice to the caller. What is it? Maurice advises her to_______ quietly with her dad and have a ____ about it.
【简答题】What does Maurice advise the caller?
【单选题】Who’s that beautiful woman ______ Maurice?