【单选题】In order to ________ the disease, the first thing we should do is to do research about it and find out a satisfactory cure.
【简答题】Who is the fax sent to? It is sent to
【单选题】We should do more such exercises in the future,I think,_____ those we did yesterday.
【判断题】Silence refers the study of nonverbal communication sent by the eyes.
【单选题】We must put _____ into practice.
【单选题】She didn’t receive the application form; it _________to the wrong address. A) sent B) be sent C) was sent D) being sent
D.
C) was sent D) being sent
【判断题】表面活性剂具有“两亲性”,但并非所有具“两亲性”的物质都可作表面活性剂来使用。
【单选题】对于表面活性物质的基本性质,下列描述不正确的是( )。
A.
表面活性物质都是由亲水性极性基团和憎水性的非急性集团所组成。
B.
表面活性物质定向排列在任意两相的,降低了表面张力。
D.
表面活性物质分子量在数百左右,介于低分子和高分子之间的一类物质。