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【多选题】
导管材料与制作中应包含下列哪项特性？A.
应光滑，以避免血栓形成。
B.
具备良好的不透X线性，使有优良的跟踪性
C.
导管的材料应该是无毒、无活性、无抗原性
D.
导管壁摩擦系数应尽可能小，以利于导管和导丝穿插顺畅
E.
导管应有良好形状记忆性
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【简答题】The grass blades, brushing with the movements of their growth, made joyous gentle sounds, like the sighs of a maiden in love.
【判断题】When economists refer to investment, they mean the purchasing of stocks and bonds and other types of saving.
A.
正确
B.
错误
【单选题】The word 'festive' in paragraph 2 can not be understood as ______.
A.
cheery
B.
fetish
C.
joyous
D.
merry
【简答题】No sooner than it began to rain．
【单选题】No sooner than it began to rain heavily.
A.
the game begin
B.
has the game begun
C.
did the game begin
D.
had the game begun
【单选题】Thanks giving feasts are ______ with big dinners and joyous reunions on the fourth Thursday in November.
A.
rewarded
B.
awarded
C.
celebrated
D.
congratulated
【单选题】Economists use the term money to refer to
A.
all wealth.
B.
all assets, including real assets and financial assets.
C.
all financial assets, but real assets are not regarded as money.
D.
those types of wealth that are regularly accepted by sellers in exchange for goods and services.
【判断题】Economists refer to fluctuations in output as the "business cycle" because movements in output are regular and predictable.
A.
正确
B.
错误
【单选题】What word do economists use to refer to the purchase of goods that will be used in the future to produce more goods and services?
A.
capital
B.
consumption
C.
investment
D.
costs
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