对于各向同性均匀介质的特定材料、特定波形、声束值可为（）。A、常量 B、变量 C、极

根据票据法律制度的规定，下列关于汇票提示承兑的表述中，正确的有（）。

A.见票后定期付款的汇票的持票人应当自出票日起3个月内向付款人提示承兑

B.汇票上没有记载付款日期的，无需提示承兑汇票

C.付款人自收到提示承兑的汇票之日起3日内不作出承兑与否表示的，视为承兑

D.承兑附有条件的，视为拒绝承兑

简述固定卸料顺出件这种结构的优点和缺点。

One of the guidelines in writing the C code for a software tool is as follows: write code that is as clear and as simple a (76) . The C language can be difficult to read if you combine all (77) features in a single statement. Break complicated (78) into several easy to understand statements for the (79) of readability. This style helps to make your programs more (80) and error-free.

A．readable

B．reusable

C．possible

D．semantic

E．syntactic

F．constructions

G．safe

H．impossible

I．sake

J．structure

怎样打开我们的胸襟？

浇注系统直浇道窝的作用是什么？