LJ501型钢筋切断机剪切钢筋时,钢筋必须放在(),并使钢筋靠紧挡料块,以保证钢筋正常切断和延长刀具寿命。
A、刀柄两端
B、刀具中、下部
C、刀具上、中部
D、刀具上部
参考答案:B
句型转换。
1. She is taking care of her sick mother. (变一般疑问句)
______ ______ taking care of her sick mother?
2. Jim felt upset just now. (变否定句)
Jim ______ ______ upset just now.
3.Tom's mother looks worried. (对画线部分提问)
______ ______ Tom's mother look?
4. Let's sing the song together, ______ ______? (完成反意疑问句)
5. 他太困了而不能做任何家庭作业。 (完成译文)
He was ______ sleepy ______ do any homework.
TFe代表的是()的成分。
A、三氧化二铝
B、全铁
C、全锰
D、二氧化硅