严禁常压锅炉带压运行,排气管上不得设置截止、隔离等阀门,室外管道需进行()处理。
A.防潮
B.防腐
C.保温
D.耐压
参考答案:C
下列各组生物中,均属于生产者的是[ ]
A.光合细菌、酵母菌
B.光合细菌、硝化细菌
C.乳酸菌、酵母菌
D.硝化细菌、乳酸菌
When it comes to talking about football, his favorite sports, with David, any time will _____ him.
A.suit
B.fit
C.match
D.equal