330MW机组汽机高中压阀门全行程活动试验必须在()进行。
参考答案:单阀方式下
The tsunami(海啸) that broke out in Southeast Asia in 2004 caused serious to everything there. [ ]
A. damage
B. hurt
C. injure
D. harm
科学施肥以四个施肥理论为基础,同时考虑()、()和()等因素。