单项选择题

G50 X200.0Z100.0指令表示（）。

A．机床回零
B．原点检查
C．刀具定位
D．工件坐标系设定

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1.In the following IELTS writing task 2 question, “To what extent do you agree or disagree” is the _ which can also be called ______ words which tell us how to respond.
Wild animals have no place in the 21st century, so protecting them is a waste of resources. To what extent do you agree or disagree?

答案： task, instruction

单项选择题

酸奶加工原理是利用乳酸菌发酵乳糖产生乳酸使牛乳酪蛋白发生凝固。

A．对
B．错