在雷雨天不要走近高压电杆、铁塔、避雷针、远离至少()米以外。
A. 10
B. 15
C. 18
D. 20
The air-conditioner is running in the winter and to be stopped, we should()
A. close Fan and Humidifier at the same time
B. firstly close Fan and then close humidifier immediately
C. firstly close humidifier and then close Fan immediately
D. firstly close humidifier and then close Fan after 30 second
恶性淋巴瘤累及颈、腹股沟淋巴结、肝及肺,并伴有发热、盗汗及体重减轻,临床分期属()
A. Ⅲa
B. Ⅳb
C. Ⅳa
D. Ⅲb
E. Ⅱb
根据主蒸汽及再热蒸汽温度的下降速度,及时调节减温水量,保证降温速度小于()℃/min。