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【单选题】
桩产生负摩阻力时，下列说法中正确的是（ ）A.
桩距越大，下拉荷载可能越小
B.
桩身轴力、桩身沉降沿深度逐步衰减
C.
单桩极限承载力由桩总侧阻力和桩端阻力组成
D.
采用涂层法措施后，可使桩身负摩阻力、沉降减小，但中性点深度变大
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【单选题】The adoption of an investment tax credit in a small open economy is likely to lead to:
A.
no change in either domestic investment or domestic saving in the small open economy.
B.
an increase in both domestic investment and domestic saving in the small open economy.
C.
an increase in domestic saving but no change in domestic investment in the small open economy.
D.
an increase in domestic investment but no change in domestic saving in the small open economy.
【简答题】带轮与主动齿轮轴间的连接方式为________连接。
【单选题】An open economy is a national economy that
A.
doesn't interact economically with the rest of the world.
B.
has a stock market that is open to traders from anywhere in the world.
C.
has extensive trading and financial relationships with other national economies.
D.
has established diplomatic relations with most other national economies.
【多选题】下列选用的起重钢丝绳安全系数中，正确的有______。
A.
用作缆风绳的安全系数不小于3.5
B.
用作滑轮组跑绳的安全系数不小于5
C.
用作吊索的安全系数不小于6
D.
用作载物的吊索安全系数不小于7
E.
用作载人的吊索安全系数不小于10～12
【多选题】下列选用的起重钢丝绳安全系数中，正确的有（）。
A.
用作缆风绳的安全系数不小于3
B.
用作滑轮组跑绳的安全系数不小于4
C.
用作吊索的安全系数不小于6
D.
用作载物的吊索安全系数不小于8
E.
用作载人的吊索安全系数不小于12
【单选题】Building an economic model based on the assumption of a small open economy is useful because:
A.
it accurately describes the U.S. economy
B.
it is more complicated and realistic than a model based on the assumption of a large open economy.
C.
this simplifying assumption can assist our understanding and intuition of open economy macroeconomics.
D.
it is not possible to build models of large open economies.
【简答题】带轮与主动齿轮轴间的连接方式为________连接。
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