皮皮学，免费搜题
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搜题
【单选题】
青黛来源于()。A.
化学合成而得结晶状物
B.
蕨类植物的成熟孢子
C.
植物的虫瘿
D.
茎叶经加工而得的粉末或团块
E.
去皮枝、干的干燥煎膏
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【简答题】I have known him _________ he was a boy of eight years
old.A. when B. since C. before D. while
【单选题】车床数控系统中,用( )指令进行恒线速控制。 A、G50 S_ B、G96 S_ C、G01 F D、G97 S_
A.
G50 S＿
B.
G96 S＿
C.
G01 F
D.
G97 S＿
【单选题】I have known him for ten years. I ____________to know him in l999.
A.
got
B.
have got
C.
was getting
D.
get
【多选题】The far-reaching influences on the development of economic thought from David Ricardo are ( ). developing classical economics to a new peak
A.
developing classical economics to a new peak
B.
a far-reaching influence on the development of western economics
C.
Marx called Ricardo the terminator of English classical political economy
D.
improving the economic achievements of predecessors
【单选题】I have known him _________ he was a boy of eight years old.
A.
when
B.
since
C.
before
D.
while
【单选题】I have known him _________ he was a boy of eight years old.
A.
when
B.
since
C.
before
D.
While
【简答题】附件 3(4) 页 要求用圆钢 ( 实料 ) 加工一个调节套 ( 件 12) 作为备件使用。 为什么在数控车床上车调节套 ( 件 12) 端面时优先选用 G96 而不是 G97 指令?请回答并说 明理由!
相关题目：
【单选题】I have known him _________ he was a boy of eight years old.
A.
when
B.
since
C.
before
D.
while