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【简答题】
DNS同时调用了TCP和UDP的53端口,其中 端口用于DNS客户端与DNS服务器端的通信,而 端口用于DNS区域之间的数据复制。
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举一反三
【单选题】My family has _____________ members. They are my parents, my brother and me. [ ]
A.
three
B.
four
C.
five
【单选题】My brother_________ Beijing many times. He __________ Nanjing for a week.
A.
has been to, has gone to
B.
has been to, has been in
C.
has gone to , has been in
D.
has gone to, has been in
【单选题】对心直动尖顶推杆盘形凸轮机构的推程压力角超过许用压力角许用值时,可采用 措施来解决。
A.
增大基圆半径
B.
改用滚子推杆
C.
改变凸轮转向
D.
改为偏置直动尖顶推杆
【单选题】My brother ______ the army for three years.
A.
has been in
B.
had entered
C.
has joined
D.
was last seeing
【单选题】My brother has studied in ______ Qinghua University for two years. It’s ______ famous university in the world. [ ]
A.
/ , the
B.
the, a
C.
the, /
D.
/ , a
【简答题】成人骨头共有208块，分为头颅骨、躯干骨、上肢骨、下肢骨四个部分。判断对错
【简答题】阅读理解，判断正(√)误(×)。 My family has four members. My dad, my mom, my brother and me. My dad is a baseball player. He is tall and strong. He likes computer s. My mom is a nurse. She has long hair and bi...
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