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【简答题】
Directions: In this section, you'll hear six conversations between two speakers. For each conversation there are several questions and each question is followed by three choices marked A, B and C. Listen carefully and then choose the best answer for each question.You will hear each conversation twice. Conversation 1. When does the conversation take place? A. At 6:30 B. At 6:00 C. At 5:302. 2. How will the speakers go to the concert? A. On foot B. By subway C. By taxi
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【简答题】MCS -51 的中断源有( )、( )、( )、( )、( ) 。
【单选题】某企业接受一批特定订货,需购买一台专用设备,价值 1 万元。在此特定订货决策中,专用设备费属于( )。
A.
重置成本
B.
沉没成本
C.
可避免成本
D.
不可避免成本
【单选题】某企业接受一批特定订货,需购买一台专用设备,价值1000元,在此特定订货决策中专用设备价值属于( )。
A.
重置成本
B.
沉没成本
C.
专属成本
D.
不可避免成本
【单选题】Tom urged that he _____ with so much work while his parents went on a snorkeling trip. [ ]
A.
was left alone
B.
not be left alone
C.
will be left alone
D.
isn't left alone