—Your sister’s plan is not quite practical.Why not try to persuade her to give it up? —My sister is very stubborn,so it is________to try to change her mind.
A.
by chance
B.
in vain
C.
on purpose
D.
for sure
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参考答案:
举一反三
【单选题】下列有关浮点数加减运算的叙述中,正确的是( )。 I. 对阶操作不会引起阶码上溢或下溢; II.右规和尾数舍入都可能引起阶码上溢; III.左规时可能引起阶码下溢; IV.尾数溢出时结果不一定溢出