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【单选题】
制造截面尺寸在30mm以下的汽车变速齿轮、轴等，选用（）。
A.
20Cr
B.
40Cr
C.
20CrMnTi
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举一反三
【单选题】Passage 3 Questions 11 to 15 are based on the following passage: Scientists in India have invented a new way to produce electricity. Their invention does not get its power from oil, coal or other fuel...
A.
Because bullocks have long been used by Indian people
B.
Because bullocks walk slowly and are easy to control.
C.
Because there are few non-working bullocks in India
D.
Because there is not enough oil in India.
【单选题】热轧H型钢HM488×300×11×18截面尺寸表示方法中，完全正确的是？
A.
腹板高度为488mm，翼缘宽度为300mm，腹板厚度为11mm，翼缘厚度为18mm。
B.
翼缘宽度为488mm，腹板高度为300mm，腹板厚度为11mm，翼缘厚度为18mm。
C.
腹板高度为488mm，翼缘宽度为300mm，腹板厚度为18mm，翼缘厚度为11mm。
D.
截面高度为488mm，翼缘宽度为300mm，腹板厚度为11mm，翼缘厚度为18mm。
相关题目：
【单选题】Passage 3 Questions 11 to 15 are based on the following passage: Scientists in India have invented a new way to produce electricity. Their invention does not get its power from oil, coal or other fuel...
A.
Because bullocks have long been used by Indian people
B.
Because bullocks walk slowly and are easy to control.
C.
Because there are few non-working bullocks in India
D.
Because there is not enough oil in India.
【单选题】热轧H型钢HM488×300×11×18截面尺寸表示方法中，完全正确的是？
A.
腹板高度为488mm，翼缘宽度为300mm，腹板厚度为11mm，翼缘厚度为18mm。
B.
翼缘宽度为488mm，腹板高度为300mm，腹板厚度为11mm，翼缘厚度为18mm。
C.
腹板高度为488mm，翼缘宽度为300mm，腹板厚度为18mm，翼缘厚度为11mm。
D.
截面高度为488mm，翼缘宽度为300mm，腹板厚度为11mm，翼缘厚度为18mm。
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