对于正在转动中的机器，不准（）和（），或直接用手往皮带上撒松香等物。
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Which two statements about VACLs on Cisco Nexus 7000 Series Switches are true？ （）
A single VACL can be shared across two or more VDCs.
B. Use of VACLs requires no special license to be installed.
C. VACLs make use of IP or MAC ACLs.
D. Only options drop and forward are permitted.
DDZ-Ⅱ型差压变送器高频位移检测放大器的振荡器与功率放大器两极之间是采取（）。
A. 电阻直接耦合
B. 电容耦合
C. 电感耦合
D. 阻容耦合
导杆机构中，滑块对导杆的作用力方向始终垂直于导杆，其压力角a的大小等于（）。
A. 0°
B. 20°
C. 90°
Which of the following phrases is TRUE regarding monitoring disk I/O with iostat？（）
A. The iostat can only be run as the root user
B. There could be zero percent I/O wait and still be an I/O bottleneck
C. Any I/O wait time displayed in output of "iostat" is an indication of severe I/O bottlenecks
D. Running "iostat" without any arguments/parameters is sufficient for resolving I/O bottleneck
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