在恒前牙中牙体大小变异最大的是（）
A.下尖牙
B.下中切牙
C.上尖牙
D.上中切牙
E.上侧切牙
参考答案：E
设计一个10岁儿童的一日食谱，需要首先确定能量、蛋白质、脂肪和碳水化合物的目标量，如果用大米为主食提供90%的碳水化合物的量。请问其碳水化合物目标量是多少，一天需要多少大米
A firm has just signed an 8-year lease on a new machine. Fair value of the machine is $100000.Lease payments are $18000 per year, payable at the end of the year. The machine has an estimated salvage value of $ 5000 at the end of the lease term. The machine has a 10-year useful life. The firm’s incremental borrowing cost is 8 percent. This lease should be classified as:（）
A. operating.
B. conventional.
C. capital.
