简述影响问题解决的主要因素。

苹果的重量是梨的60%，苹果的重量比梨少______%．

在括号里填上适当的数，使每一个方程中x都等于3．

______+x=3.4

x-______=0.2

______×x=3

x÷______=30

______+x=3.9

x-______=2.8

x-______=1.6

______+x=6.2

x÷______=300．

_____ that Marie was able to set up new branches elsewhere.[ ]

A. So successful her business was

B. So successful was her business

C. So her business was successful

D. So was her successful business

消除系统中的危险源，可以从()防止事故的发生。

A．根本上

B．过程中

C．观念上

D．生产中

以下程序的输出结果是 #include＜iostream＞ using nameSpace std； int main() {cout.fill('*')；cout．width(5)；cout＜＜hex＜＜100＜＜end1；return 0； }

A．**100

B．***64

C．100**

D．64***