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【单选题】
The tourist is forbidden to enter a country if he does not have a (an) ______ passport.
A.
operative
B.
valid
C.
effective
D.
efficient
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【多选题】凸轮机构的从动件按从动件端部形状不同可分为( ) 三种形式。
A.
尖顶从动件
B.
滚子从动件
C.
平底从动件
D.
圆底从动件
【简答题】We usually have three meals. We have breakfast, lunch and supper. We often have more time for lunch and supper, and we eat a big lunch or supper. But a good breakfast is very important (重要的). It’s eas...
【简答题】在较理想的土壤中矿物质体积比约占38%—45%,有机质约占5%—12%,孔隙约占50%(孔隙由水和空气此消彼长组成)。土壤组成受当地环境影响,有明显的地域差异。下图为我国黄土高原,东北平原,塔里木盆地和长江中下游平原四地土壤结构组成图。完成下列各题。 小题1:上图为黄土高原土壤的是 A.① B.② C.③ D.④ 小题2:适合水稻种植的土壤是 A.① B.② C.③ D.④ 小题3:下列有关四地说...
【多选题】按凸轮的形状不同可分为( )三种形式。
A.
盘形凸轮
B.
移动凸轮
C.
圆柱凸轮
D.
弧形凸轮
【简答题】构成土壤有机质的主体是 ,占有机质的 。
【单选题】著名的“毛毛虫实验”表明,大多数人具有()思维定势。
A.
直线型
B.
书本型
C.
经验型
D.
从众型
【简答题】请在下课时把自己学习的过程截图上传
【单选题】—Your brother often disagrees with you, __________ he? —__________. We often have different opinions. [     ]
A.
does; Yes
B.
doesn’t; Yes
C.
does; No
D.
doesn’t; No
【单选题】We often have sports after class, and I like to play _____ basketball.
A.
a
B.
an
C.
the
D.
/
【简答题】阅读理解。 We usually have three meals. We have breakfast, lunch and supper. We often have more time for lunch and supper, and we eat a big lunch or supper. But a good breakfast is very important (重要的). It...
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