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【单选题】
第三代高效减水剂是A.
木钙
B.
萘系减水剂
C.
聚羧酸盐
D.
三聚氰胺
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参考解析：
知识点：
皮皮学刷刷变学霸
举一反三
【多选题】 class MakeFile { 11. public static void main（String[] args） { 12. try { 13. File directory = new File（”d”）； 14. File file = new File（directory，”f”）； 15. if（!file.exists（）） { 16. file.createNewF...
A.
Line 16 is never executed.
B.
An exception is thrown at runtime.
C.
Line 13 creates a File object named “d”.
D.
Line 14 creates a File object named “f‟.
E.
Line 13 creates a directory named “d” in the file system.
F.
Line 16 creates a directory named “d” and a file “f” within it in the file system.
G.
Line 14 creates a file named "f " inside of the directory named “d” in the file system.
【单选题】Which does not belong to the features of summative assessment?
A.
Based on testing.
B.
Memory work focused.
C.
Presented in marks and grades.
D.
Focused on the process of learning.
【单选题】Husband: Shall we run around the park or go for a bike ride? Wife: It makes no difference to me. They are both good activities. 18. What does the wife say about the activities?
A.
They aren't very good because they’re so different.
B.
She thinks they should do both.
C.
It doesn't matter which one they do.
D.
It doesn't matter whether they do the activities or not.
【单选题】When prices are (6;3); Holly chooses the bundle (9;18) and when prices are (1;2); she chooses the bundle (8;14). Which of the following is true?
A.
The bundle (9;18) is revealed preferred to the bundle (8;14) and she does not violate WARP.
B.
She violates SARP but not WARP.
C.
The bundle (8;14) is revealed preferred to the bundle (9;18) and she does not violate WARP.
D.
She violates WARP.
【简答题】影响铸铁石墨化的主要因素有（）和（）。
【简答题】影响铸铁石墨化的主要因素有（）和（）
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