MPEGⅡ压缩格式(隔行扫描)中亮度的取样频率为()。
A.6.75MHZ
B.13.5MHZ
C.27MHZ
D.4.43MHZ
参考答案:B
痰饮内停的口渴与饮水表现为()。
A.渴不多饮,兼身热不扬、头身困重
B.口燥咽干不多饮,兼颧红盗汗、舌红少津
C.渴喜热饮,饮量不多,或饮入即吐
D.口干但欲漱水而不欲咽
E.口渴饮水不多,兼身热夜甚,心烦不寐
Operation of the valve control release on a fixed CO2 system must immediately().
A.release CO2 to the protected space
B.secure all mechanical ventilation in the protected space
C.sound the rig's general alarm signal for a fire
D.sound an alarm in the ballast control room