空压机一级安全阀开启压力范围是(),二级开启范围是()。
参考答案:0.3MPa--0.35MPa;1.02MPa--1.1MPa
有以下程序: int fa(int x) { return x *x;} int fb(int x) { return x *x *x;} int f(int( *f1)( ),int( *f2)( ),int x) { return f2(x)-f1(x);} main( ) { int i; i=f(fa,fb,2);printf("%d\n",i); } 程序运行后的输出结果是( )。
A.-4
B.1
C.4
D.8
I am afraid that you have to alter your()views in light of the tragic news that has just arrived.
A.indifferent
B.distressing
C.optimistic
D.pessimistic