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【单选题】
Breads made with wheat bran and ------- whole grains are a good source of dietary fiber.A.
) same
B.
) that
C.
) other
D.
) each
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【简答题】粗牙普通螺纹,公称直径20,螺距2.5,中、顶径公差带7H,短旋合长度,右旋,标出规定代号____。
【单选题】一粗牙普通螺纹，公称直径20，螺距2.5，右旋，中、顶径公差带代号6g,旋入长度代号为L。查表写出螺纹的规定代号。
A.
M20 -6g-L
B.
M20x2.5 -6g-L
C.
M20x2.5 -6g6g-L
D.
M20 -6g
【多选题】Choose the suitable words from below and fill A, B, C......or O in each blank.
A.
resources
B.
other
C.
best
D.
As
E.
entertain
F.
take
G.
thinking
H.
mental
I.
cool
J.
reason K. performance L. wet M. next N. environmentally O. rest If you are like most people, your intelligence varies from season to season. You are probably a lot sharper in spring than you are at any _____1____ time of the year. Spring appears to be the _____2 ____ period of the year for thinking. One _____3 ____ may be that in spring man's _____4 ____ powers are affected by the same factors that bring about great changes in all nature. Autumn is the _____5 ____ best season, then winter. _____6 ____ for summer, it seems to be a good time to _____ 7____ a long vacation from thinking! It has been found that _____8 ____ weather is much more favorable for creative _____ 9____ than is summer heat. This does not mean that all people are less intelligent in summer than they are during the _____10 ____ of the year. It does mean, however, that the mental powers of large numbers of people tend to be lowest in summer.
【单选题】下列各组离子在给定溶液中可能大量共存的是 [ ]
A.
向无色溶液中加氯水，溶液变为橙色：SO 4 2- 、Br - 、NO 3 - 、Ag +
B.
使酚酞试液变红的溶液中：K + 、Na + 、NH 4 + 、HCO 3 -
C.
向其中加铝粉有氢气放出的溶液中：K + 、Na + 、H + 、NO 3 -
D.
在常温下，水电离出的c(H + )= 10 -13 mol/L的溶液中：Na + 、AlO 2 - 、CO 3 2- 、SO 3 2-
【单选题】对下列各种溶液中大量共存离子的判断合理的是（ ）
A.
向无色溶液中加氯水，溶液变为橙色，溶液中一定有：SO 4 2- 、Br - 、NO 3 - 、Ag +
B.
使酚酞试液变红的溶液中可能有：K + 、Na + 、NH 4 + 、HCO 3 -
C.
在水电离出的c（H + ）=10 -5 mol/L的溶液中可能有：Na + 、AlO 2 - 、CO 3 2- 、SO 3 2-
D.
向溶液中加铝粉有氢气放出，则该溶液中一定有：K + 、Na + 、H + 、NO 3 -
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