AB-PLC固件升级时如果断电可以重新启动。()
参考答案:错
Viewers continue to watch TV ______ they complain about the quality of the programming.
A.even though
B.as if
C.as long as
D.unless
关于颅脑冠状位扫描技术的描述,错误的是
A.患者体位有颌顶位和顶颌位B.颌顶位,听眦线与台面趋于平行C.顶颌位,正中矢状面与台面中线垂直D.层厚与层间距,视被检部位的大小选择3~5mmE.头皮下软组织病变,首选冠状位扫描