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【单选题】
关于放射防护,下列哪种说法是 错误 的A.
X 线穿透人体一定会产生生物损害
B.
限制每次检查的照射次数，避免短期不必要的多次重复检查
C.
使用原子序数较高的物质材料阻挡 X 线
D.
屏蔽防护是最主要的防护措施之一
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举一反三
【单选题】My sister suggested that I_____accept the invitation.
A.
could
B.
must
C.
should
D.
might
【单选题】Linux多线程应用编程中，下列哪种情况会导致pthread_rwlock_wrlock成功执行并返回
A.
互斥量解锁成功
B.
当前没有任何线程申请了读写锁
C.
当前只有线程申请了读锁
D.
当前已有线程申请了写锁
【单选题】The Greens often eat vegetables. They have_________eating habits.
A.
healthy
B.
unhealthy
C.
great
【单选题】My sister suggested that I ______ the invitation
A.
accepted
B.
could, accept
C.
had accept
D.
accept
【简答题】My sister suggested that I____ the invitation.A. accepted B. could accept C. had accept D. A. accept
【单选题】My sister suggested that l ______accept the invitation.
A.
could
B.
must
C.
should
D.
might
【单选题】My mother suggested that not only ______ study hard myself but also _____help my sister. [ ]
A.
I should; I should
B.
should I; should I
C.
should I; I should
D.
I should; should I
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