硬盘工作时，磁头与磁盘之间有0.1－0.3μm的间隙，二者不接触。
参考答案：对
什么是国债发行市场？
Having gone through several rounds of selection, the young man ______ gained a chance to perform in China Talent.
A．constantly
B．unfortunately
C．eventually
D．temporarily
