如何使沼气灯明亮?
参考答案:
为使沼气灯明亮,必须调节风门。方法是:调整沼气灯上方的风门,边调边看,直到灯亮、明火消失为止。
China’s first manned spaceship “Shenzhou Ⅴ” was sent up into space on October 15 and returned safely to the earth on October 16,______ is a great honour for our great motherland.
A.that
B.which
C.what
D.it
何谓有害生物综合治理(IPM)和全部种群治理(TPM)?有害生物综合治理的理论基础和指导原则是什么?