你想让你的朋友等一会该说:( )
A:I'm ready.
B:Just a minute.
C:Bye.
A. It's a naughty bird.
B. She is a cute girl.
C. The boy is very clever.
D. It's a cute elephant.
E. The teacher is very nice.
已知函数f(x)=sinx+cosx,x∈R.求f(π12)的值
根据欧姆定律公式I=UR ,可变形得到R=UI .对此,下列说法中正确的是( )
反应时间/min
n(CO)/mol
n(H2O)/mol
n(CO2)/mol
n(H2)/mol
0
1.20
0.60
t1
0.80
t2
0.20