空蚀
参考答案:当空化水流运动到压力较高处,由于汽泡溃灭,伴随着声响和巨大的冲击作用,当这种作用力超过结构表面材料颗料的内聚力时,便产生剥离状的破坏,这种破坏现象称为空蚀。
按要求完成句子(每空1分.共10分)。
小题1:There's something to eat in the cupboard.(改为一般疑问句)
__________ there__________ to eat in the cupboard?
小题2:She has hardly had anything this morning, ________ ________ ?( 改为反意疑问句)
小题3:She does the housework every day.
She ________ __________ the housework every day.( 改为否定句)
小题4:He was playing basketball at four yesterday afternoon. (对划线部分提问)
What _______ he__________ at four yesterday afternoon?
小题5:It is great fun to have a picnic on the hillside.(改为感叹句)
__________ _________it is to have a picnic on the hillside.
"领带有哪些用途?"这样的提问可以用来训练学生的哪一种思维?()
A.形象思维
B.发散思维
C.辐合思维
D.直觉思维