皮皮学，免费搜题
登录
搜题
【判断题】
工件加工时,切削力大需要的夹紧力也大,则零件会变形。为了控制零件变形,最好 在粗、精加工时采用不同的 夹紧力。( ) 180.数控机床坐标系是机床固有的坐标系,一般情况下不允许用户改动。( ) 对A.
正确
B.
错误
拍照语音搜题，微信中搜索"皮皮学"使用
参考答案：
参考解析：
知识点：
皮皮学刷刷变学霸
举一反三
【单选题】______ the 1500s ______ the first European explored the coast of California.
A.
It was not until... when
B.
It was until... when
C.
It was not until... that
D.
It was until... that
【单选题】_______ the 1500s ____ the first Europeans explored the coast of California.
A.
It was until…then
B.
It was not until…when
C.
It is until…that
D.
It was not until…that
【单选题】Whose possession has the house _________ since the 1500s?
A.
taken
B.
been taken
C.
been in
D.
come into
【简答题】溶剂浸提法是指____,又称为____。溶剂萃取法是在样品液中加入一种____溶剂,这种溶剂称为____,使待测成分从____中转移____中而得到分离。
【简答题】溶剂浸提法是指 ,又称为 。溶剂萃取法是在样品液中加入一种 溶剂,这种溶剂称为 ,使待测成分从 中转移到 中而得到分离。
【简答题】溶剂浸提法是指用适当的溶剂将固体样品中的某种被测组分浸取出来,又称为____。溶剂萃取法是在样品液中加入一种与样液互不相溶的溶剂,这种溶剂称为____,使待测成分从一相中转移到另一相中而得到分离。
【单选题】It () the 1500s () the first European explored the coast of California.
A.
was not until / that
B.
is not until / that
C.
is not until / when
D.
was until / that
相关题目：