【单选题】How did the Japanese couple punish their son?
A.
They hit the son for throwing stones at cars.
B.
They let the son stay in the forest for six days.
C.
They drove away leaving their son by the road.
D.
They made him pick vegetables in the mountains.
【单选题】How did the Japanese couple punish their son?
A.
They hit the son for throwing stones at Cars.
B.
They let the son stay in the forest for six days.
C.
They drove away leaving their son by the road.
D.
They made him pick vegetables in the mountains.
【判断题】防冻开关主要由低温传感器、内部开关、导线等组合而成。
【单选题】固定化酶是从20世纪60年代迅速发展起来的一种技术。科研人员用海藻酸钠作为包埋剂来固定小麦酯酶,以研究固定化酶的相关性质和最佳固定条件。酶活力为固定化酶催化化学反应的总效率,包括酶活性和酶的数量。图甲、乙、丙为部分研究结果。下列叙述错误的是( )
A.
由图甲可知,固定化酯酶比游离酯酶对温度变化适应性更强
B.
由图乙可知,浓度为3%的海藻酸钠包埋效果最好
C.
由图丙可知,固定化酯酶一般可重复使用3次,之后若继续使用则酶活力明显下降
D.
固定化酶的酶活力较高,主要原因是增加了酶与底物的接触面积
【单选题】When did the Japanese people learn how to make paper?
【单选题】How did the Japanese woman travel on a five-day tour around Europe?
【单选题】1与一般催化剂相比,酶催化具备一些特殊的特点,它们是( )
D.
加快反应速率、催化剂可反复使用、降低反应活化能