MG2×375-W采煤机适应煤质()。
A。软中硬
B。中硬
C。硬
D。中硬较硬
参考答案:D
— Her father is very rich.
—________ She wouldn’t accept his help even if it were offered.
A.What for?
B.No wonder.
C.No doubt.
D.So what?
温室内种植蔬菜,为了提高产量,除了施肥,浇水外,还应采取的措施是:[ ]
A.增加空气湿度
B.降低空气湿度
C.增加氧气的浓度
D.增加二氧化碳的浓度