铝合金熔体浇入铸型后，其流动性的好坏主要由（）来决定。
A.含气量
B.氧化夹杂
C.温度
D.合金自身成分
参考答案：D
直线y=kx+4经过点A（1，6），求关于x的不等式kx+4≤0的解集．
Which of the following is closest in meaning to what you’ve just heard
A．You caught me so you can put me in jail.
B．You can’t escape because I got hold of you.
C．You’ve got my ideas.
D．You’ve asked a question I can’t answer.
