轴承与轴的配合应为（）。A、间隙 B、过盈 C、过渡 D、无要求

1) ______ the theory of language underlying the natural approach
2) ______ the theory of learning underlying the natural approach
3) ______ one of the objectives of the natural approach
4) ______ one of the techniques of the natural approach
5) ______ one of the main features of the natural approach
a) problem solving activities
b) to help the students to develop basic communication skills
c) class time being devoted primarily to providing input for acquisition
d) communications as the primary function of language
e) the monitor model

某些含油中药的油质溢于中药表面的现象称之为（）

A．山楂调中丸 

B．开胃山楂丸 

C．葛根芩连微丸 

D．养胃舒胶囊 

E．龙荟丸

Austin-Flint（奥-弗氏）杂音系指于（）区在（）期听到的一种病理性杂音。

燃料的高、低位发热量有何区别？

（）是社会进步的标志之一。

A.繁荣

B.文明

C.富裕

D.富足