中国兰无土栽培常用基质为()。
A、园土
B、砖土加腐叶土
C、水藓
D、泥炭
参考答案:B
________ at the result, the boss left without saying any word.
A.Having disappointed
B.Disappointing
C.To be disappointed
D.Disappointed
当x=3,y=1.2时,10x+2y的值是[ ]
A.20.4
B.8.4
C.32.4
D.0