锅炉冬季保养正确的是()。
A、尽可能采用干式保养;
B、停炉后应微开减温水各疏水;
C、锅炉燃油系统应投入备用;
D、冬季伴热系统管道尽量不安排检修。
参考答案:A, B, C, D
My family ______ watching TV in the sitting room now. My family ______ a big one. [ ]
A. are; is
B. is; are
C. are; are
D. is; is