【简答题】半导体发光二极管的工作原理是(),而激光二极管的工作原理是()。
【单选题】One way for an animal to become transparent is to ________.
A.
change the direction of light travel
B.
gather materials to scatter light.
C.
avoid the absorption of light
D.
grow bigger to stop light.
【简答题】In this way, the body attempts to keep the amount of salt in the blood at the nec-essary level. The result is a slow drying up of body and, finally, death. The person dies of thirst.
【单选题】四环素类抗生素能和金属离子形成红色配位化合物的依据为
【简答题】The way language teachers teach in the classroom is to some extent influenced by the way they (l) languages.
【单选题】四环素类抗生素药物能和金属离子形成红色配位化合物的依据为
【判断题】“Shipment on September l5”is a flexible way of stipulating the date of shipment( )
【单选题】According to the Macbeth principle of morality, washing is a way to ______.
A.
show strong link between moral and physical purity.
B.
get rid of things which are contaminated.
D.
regulate ethical behavior