预应力锚索钢绞束下料时要采用()切割,严禁用电弧切割。
参考答案:切割机或砂轮锯
Mr. Read is the person to ___________ you should write.
A.whom
B.who
C.which
D.that
摄氏度为27℃气体,它的热力学温度()。