把方程(x+1)(x-2)=4化成一元二次方程的一般形式为( ),它的一次项系数是( )。
x2-x-6=0;-1
—Will you please _____ it to me on Friday?
—What about Saturday? My computer doesn't work well these days. [ ]
A. send
B. give
C. e-mail
D. bring
变种的拉丁学名的缩写是()。
A.subsp.
B.ssp.
C.var.
D.F.