【单选题】闭合导线测内角时角度闭合差的分配原则是反符号按( )分配。
【单选题】Lying between machine languages and high-level languages are languages which called _______ .
【判断题】在交流电路 u =220cos(100πt+30) V中,其频率为100Hz,有效值是220V
【单选题】Why did Henry David Thoreau wish to live simply?
A.
he thought that striving for a high income could become a vicious circle
B.
he was rather lazy and did not exemplify the American Dream
C.
he was disabled an unable to work hard
D.
he was the follower of an ancient hedonistic philosophy that called for pleasure in life
【单选题】What crop did Thoreau cultivate at his cabin?
【单选题】How long did Thoreau live in the woods of Walden Pond?
C.
One year and one month.
D.
Two years and two months.
【单选题】阿基米德数Ar是决定射流弯曲程度的主要因数,则在冷射流时( )。
【单选题】On what day did Thoreau move into his cabin?