当甲烷浓度为（）时，爆炸力最大。
A、7％
B、7.5％
C、8％
D、9.5％
参考答案：D
《素问·经脉别论》中"毛脉合精，行气于府，府精神明，留于四脏"，四脏是指（）
A.肝心脾肺
B.肝心脾肾
C.肝脾肺肾
D.心肺肝脾
E.心肺肝肾
These days the government has issued several economic policies that will________prosperity of
manufacturing industry.[ ]
A. accumulate
B. accomplish
C. access
D. accelerate
