有四张牌,分别是两张梅花和两张红桃,随意摸取其中的一张,摸到红桃的可能性是______.
2÷4=12;
答:摸到红桃的可能性是12;
故答案为:12.
—What can I do for you, sir?
—No, I only want to speak to the person __________.[ ]
A. in danger
B. in return
C. in peace
D. in charge
定位元件的材料一般选:()
A.20钢渗碳淬火
B.铸铁
C.中碳钢淬火
D.硬质合金