玉米螟以老熟幼虫越冬,越冬场所主要有()
A.玉米秆、高梁秆
B.玉米穗轴、棉花枯铃、茎秆
C.土壤
D.枯枝落叶
参考答案:A, B, D
The old temple damaged in the earthquake ____ the Qing Dynasty.
A.is dated back to
B.dates from
C.dated back to
D.was dating from
汽轮机转子的平衡精度一般为()
A.G16
B.G6.3
C.G2.5
D.G1